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Debt - Senior Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jul. 31, 2014
Debt Instrument [Line Items]            
Debt issued $ 2,500,000,000.0   $ 2,500,000,000.0      
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging            
Debt Instrument [Line Items]            
Derivative liability 2,400,000,000   2,400,000,000     $ 2,400,000,000
Senior Notes            
Debt Instrument [Line Items]            
Redemption price, percentage, in the event of change of control   101.00%        
Interest expense 74,000,000 $ 68,000,000 142,000,000 $ 118,000,000    
Fair value of long-term debt 11,500,000,000   11,500,000,000   $ 8,900,000,000  
Senior Notes | Floating rate, Senior notes due 2023            
Debt Instrument [Line Items]            
Debt issued $ 400,000,000   $ 400,000,000      
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%        
Senior Notes | 2.150% Senior notes due 2020            
Debt Instrument [Line Items]            
Debt issued $ 500,000,000   $ 500,000,000      
Coupon rate, fixed rate notes 2.15%   2.15%      
Senior Notes | 2.750% Senior notes due 2023            
Debt Instrument [Line Items]            
Debt issued $ 750,000,000   $ 750,000,000      
Coupon rate, fixed rate notes 2.75%   2.75%      
Senior Notes | 3.600% Senior notes due 2027            
Debt Instrument [Line Items]            
Debt issued $ 850,000,000   $ 850,000,000      
Coupon rate, fixed rate notes 3.60%   3.60%