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Debt - Senior Notes (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2014
Debt Instrument [Line Items]        
Face amount $ 2,500,000,000      
Fair Value Hedging | Interest Rate Swap | Designated as Hedging Instrument        
Debt Instrument [Line Items]        
Derivative liability $ 2,400,000,000     $ 2,400,000,000
Senior Notes        
Debt Instrument [Line Items]        
Redemption percentage in event of change in control 101.00%      
Interest expense $ 318,000,000 $ 307,000,000 $ 254,000,000  
Fair value of long-term debt 9,000,000,000.0 $ 10,100,000,000    
Senior Notes | Senior notes due 2023        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Senior Notes | Senior notes due 2018        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 2.50%      
Repayments of debt $ 750,000,000      
Senior Notes | Senior notes due 2022        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 3.80%      
Senior Notes | Senior notes due 2056        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 6.00%      
Redemption price percentage 100.00%      
Senior Notes | Senior notes due 2020        
Debt Instrument [Line Items]        
Face amount $ 500,000,000      
Coupon rate, fixed rate notes 2.15%      
Senior Notes | Senior notes due 2023        
Debt Instrument [Line Items]        
Face amount $ 750,000,000      
Coupon rate, fixed rate notes 2.75%      
Senior Notes | Senior notes due 2027        
Debt Instrument [Line Items]        
Face amount $ 850,000,000      
Coupon rate, fixed rate notes 3.60%      
Senior Notes | Senior notes due 2017        
Debt Instrument [Line Items]        
Coupon rate, fixed rate notes 1.35%      
Repayments of debt $ 1,000,000,000.0      
Senior Notes | Senior notes due 2017        
Debt Instrument [Line Items]        
Repayments of debt $ 450,000,000