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Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 26, 2018
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]          
Reduction of long-term debt       $ 944 $ 0
Redemption Premium       30  
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions       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  
Early Repayment of Senior Debt   $ 566      
Debt Instrument, Face Amount     $ 1,035 $ 1,035  
Debt Instrument, Interest Rate, Stated Percentage     7.717% 7.717%  
Redemption Premium     $ 14 $ 14  
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%