Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details) (Accumulated Other Comprehensive Income)

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Summary of Significant Accounting Policies (Details) (Accumulated Other Comprehensive Income) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 416 [1],[2] $ (412) $ 187
Unrealized gains arising during the period, net of tax effects 18 1  
Reclassification adjustment for (gains) losses realized and included in net income (loss), net of tax effects (7) 2  
Total other comprehensive income 11 3 (3)
Ending balance 611 [1],[2] 416 [1],[2] (412)
Unrealized gains (losses) on available-for-sale securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1) (1)  
Unrealized gains arising during the period, net of tax effects 1 0  
Reclassification adjustment for (gains) losses realized and included in net income (loss), net of tax effects 0 0  
Total other comprehensive income 1 0  
Ending balance 0 (1) (1)
Unrealized gains (losses) on cash flow hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (4) (7)  
Unrealized gains arising during the period, net of tax effects 17 1  
Reclassification adjustment for (gains) losses realized and included in net income (loss), net of tax effects (7) 2  
Total other comprehensive income 10 3  
Ending balance 6 (4) (7)
Accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (5) (8) (5)
Total other comprehensive income 11 3 (3)
Ending balance $ 6 $ (5) $ (8)
[1] Amounts reflected adoption of FASB ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs beginning in the first quarter of 2016.
[2] Amounts reflected adoption of FASB ASU 2015-17, Balance Sheet Classification of Deferred Taxes beginning in the first quarter of 2016.