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Debt - Carrying Value of Outstanding Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jul. 31, 2019
Dec. 31, 2018
Long-Term Debt        
Long-term debt $ 7,750     $ 9,300
Hedge accounting fair value adjustments 15     (10)
Unamortized discount and debt issuance costs (44)     (55)
Other long-term borrowings 17     0
Current portion of long-term debt 1,000     1,550
Total long-term debt 6,738     7,685
Short-Term Debt        
Current portion of long-term debt 1,000     1,550
Hedge accounting fair value adjustments (1) 0     (7)
Unamortized discount and debt issuance costs (1)     (1)
Other indebtedness 23     4
Total short-term debt 1,022     1,546
Total Debt 7,760     9,231
Senior Notes | Senior notes due 2019        
Long-Term Debt        
Long-term debt $ 0     $ 400
Effective interest rate 0.00%     3.123%
Senior Notes | Senior notes due 2023        
Long-Term Debt        
Long-term debt $ 400     $ 400
Effective interest rate 2.913%     3.499%
Senior Notes | Senior notes due 2019        
Long-Term Debt        
Coupon rate, fixed rate notes 2.20%   2.20%  
Long-term debt $ 0     $ 1,150
Effective interest rate 0.00%     2.346%
Senior Notes | Senior notes due 2020        
Long-Term Debt        
Coupon rate, fixed rate notes 3.25%      
Long-term debt $ 500     $ 500
Effective interest rate 3.389%     3.389%
Senior Notes | Senior notes due 2020        
Long-Term Debt        
Coupon rate, fixed rate notes 2.15%      
Long-term debt $ 500     $ 500
Effective interest rate 2.344%     2.344%
Senior Notes | Senior notes due 2021        
Long-Term Debt        
Coupon rate, fixed rate notes 2.875% 2.875% 2.875%  
Long-term debt $ 750     $ 750
Effective interest rate 2.993%     2.993%
Senior Notes | Senior notes due 2022        
Long-Term Debt        
Coupon rate, fixed rate notes 3.80%      
Long-term debt $ 750     $ 750
Effective interest rate 3.989%     3.989%
Senior Notes | Senior notes due 2022        
Long-Term Debt        
Coupon rate, fixed rate notes 2.60%      
Long-term debt $ 1,000     $ 1,000
Effective interest rate 2.678%     2.678%
Senior Notes | Senior notes due 2023        
Long-Term Debt        
Coupon rate, fixed rate notes 2.75%      
Long-term debt $ 750     $ 750
Effective interest rate 2.866%     2.866%
Senior Notes | Senior notes due 2024        
Long-Term Debt        
Coupon rate, fixed rate notes 3.45% 3.45% 3.45%  
Long-term debt $ 750     $ 750
Effective interest rate 3.531%     3.531%
Senior Notes | Senior notes due 2027        
Long-Term Debt        
Coupon rate, fixed rate notes 3.60%      
Long-term debt $ 850     $ 850
Effective interest rate 3.689%     3.689%
Senior Notes | Senior notes due 2042        
Long-Term Debt        
Coupon rate, fixed rate notes 4.00%      
Long-term debt $ 750     $ 750
Effective interest rate 4.114%     4.114%
Senior Notes | Senior notes due 2056        
Long-Term Debt        
Coupon rate, fixed rate notes 6.00%      
Long-term debt $ 750     $ 750
Effective interest rate 6.547%     6.547%
LIBOR | Senior Notes | Senior notes due 2019        
Long-Term Debt        
Coupon rate, floating rate notes 0.48%      
LIBOR | Senior Notes | Senior notes due 2023        
Long-Term Debt        
Coupon rate, floating rate notes 0.87%