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Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]        
Reduction of long-term debt     $ 944 $ 0
Redemption Premium   $ 30 30  
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions   37 37  
Principal1035MaturityAugust2018 [Member]        
Debt Instrument [Line Items]        
Reduction of long-term debt     343  
Early Repayment of Senior Debt $ 160      
Debt Instrument, Face Amount   $ 1,035 $ 1,035  
Debt Instrument, Interest Rate, Stated Percentage   6.817% 6.817%  
Principal1035MaturityFebruary2019 [Member]        
Debt Instrument [Line Items]        
Reduction of long-term debt     $ 469  
Debt Instrument, Face Amount   $ 1,035 $ 1,035  
Debt Instrument, Interest Rate, Stated Percentage   7.717% 7.717%  
Principal1000MaturityFebruary2021 [Member]        
Debt Instrument [Line Items]        
Reduction of long-term debt     $ 132  
Debt Instrument, Face Amount   $ 1,000 $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage   4.75% 4.75%