Quarterly report pursuant to Section 13 or 15(d)

Debt (Details) (Narrative)

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Debt (Details) (Narrative) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 3 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Dec. 28, 2013
Jun. 28, 2014
6.75% Senior Notes due 2019
Jun. 28, 2014
7.00% Senior Notes due 2024
Mar. 29, 2014
6.00% Convertible Senior Notes Due 2015 [Member]
Mar. 29, 2014
Repurchase of 6.00% Notes Pursuant to Tender Offer
Mar. 29, 2014
Repurchase of 6.00% Notes in Open Market
Jun. 28, 2014
8.125% Senior Notes Due 2017
Mar. 29, 2014
8.125% Senior Notes Due 2017
Jun. 28, 2014
6.00% Convertible Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]                      
Debt instrument, issuance date       Feb. 26, 2014 Jun. 16, 2014            
Debt instrument, face amount       $ 600 $ 500            
Debt instrument, maturity date       Mar. 01, 2019 Jul. 01, 2024            
Long-term debt, redemption terms       At any time before March 1, 2017, the Company may redeem up to 35% of the aggregate principal amount of the 6.75% Notes within 90 days of the closing of an equity offering with the net proceeds thereof at a redemption price equal to 106.75% of the principal amount thereof, together with accrued and unpaid interest to but excluding the date of redemption. At any time before March 1, 2019, the Company may redeem some or all of the 6.75% Notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest and a “make whole” premium (as set forth in the 6.75% Indenture). At any time before July 1, 2017, the Company may redeem up to 35% of the aggregate principal amount of the 7.00% Notes within 90 days of the closing of an equity offering with the net proceeds thereof at a redemption price equal to 107.000% of the principal amount thereof, together with accrued and unpaid interest to but excluding the date of redemption. Prior to July 1, 2019, the Company may redeem some or all of the 7.00% Notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest and a “make whole” premium (as set forth in the 7.00% Indenture).            
Percentage of repurchase price over to principal amount       101.00% 101.00%            
Debt instrument, increase (decrease), net             (423) (64) (452) (48)  
Repayments of debt, including accrued interest             460 69 480 51  
Interest paid             10 1 7 1  
Loss on debt redemptions 64 0       10     49 5  
Short-term debt, gross                     42
Long-term debt, gross                 0    
Short-term debt, net of discount 96   55               41
Debt instrument, unamortized discount                     $ 1