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Debt - Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Jul. 31, 2014
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging        
Debt Instrument [Line Items]        
Derivative liability $ 2,400     $ 2,400
Senior Notes        
Debt Instrument [Line Items]        
Redemption price, percentage, in the event of change of control   101.00%    
Interest expense 68 $ 50    
Fair value of long-term debt $ 9,000   $ 8,900  
Senior Notes | 2.500% Senior notes due 2018        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 2.50% 2.50%    
Senior Notes | 3.800% Senior notes due 2022        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 3.80% 3.80%    
Senior Notes | 6.000% Senior notes due 2056        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 6.00% 6.00%    
Redemption price, percentage   100.00%