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Debt - Debt Issuances and Redemptions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]            
Loss on early extinguishment of debt     $ 0 $ 26 $ 42 $ 52
2037 Senior Notes [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 800        
Proceeds from issuances of long-term debt   $ 789        
Debt Instrument, Interest Rate, Stated Percentage     5.00%   5.00%  
Debt Instrument, Redemption Period, Minimum Number of Months Prior to Maturity Date, Redemption Price Equals Optional Redemption Price         6 months  
Debt Instrument, Redemption Period, Maximum Number of Months Prior to Maturity Date, Redemption Price Equals Principal Amount         6 months  
Debt Instrument, Redemption Price, Percentage         100.00%  
2028 Senior Notes [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount $ 1,350          
Proceeds from issuances of long-term debt 1,330          
Debt Instrument, Interest Rate, Stated Percentage     4.20%   4.20%  
Debt Instrument, Redemption Period, Minimum Number of Months Prior to Maturity Date, Redemption Price Equals Make-Whole Price         6 months  
Debt Instrument, Redemption Period, Maximum Number of Months Prior to Maturity Date, Redemption Price Equals Principal Amount         6 months  
Debt Instrument, Redemption Price, Percentage         100.00%  
2015 Credit Facilities [Member]            
Debt Instrument [Line Items]            
Repayments of Long-term Debt 369          
Commitments prepaid or terminated $ 1,600       $ 1,600  
Loss on early extinguishment of debt         $ 42