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Debt - Carrying Value of Outstanding Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Jul. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt          
Total senior notes $ 7,750       $ 7,750
Hedge accounting fair value adjustments 10       15
Unamortized premium/(discount) and debt issuance costs (20)       (44)
Other long-term borrowings 5       17
Current portion of long-term debt 0       1,000
Total long-term debt 7,745       6,738
Short-Term Debt          
Current portion of long-term debt 0       1,000
Unamortized premium/(discount) and debt issuance costs 0       (1)
Other short-term borrowings 18       21
Total short-term debt 18       1,020
Total Debt 7,763       7,758
Senior Notes | Floating rate, Senior notes due 2023          
Long-Term Debt          
Total senior notes $ 400       $ 400
Effective interest rate 1.187%       2.913%
Senior Notes | Floating rate, Senior notes due 2023 | LIBOR          
Long-Term Debt          
Variable rate 0.87%        
Senior Notes | 3.250% Senior notes due 2020          
Long-Term Debt          
Coupon rate, fixed rate notes 3.25% 3.25%      
Total senior notes $ 0 $ 500     $ 500
Effective interest rate 0.00%       3.389%
Senior Notes | 2.150% Senior notes due 2020          
Long-Term Debt          
Coupon rate, fixed rate notes 2.15%   2.15%    
Total senior notes $ 0       $ 500
Effective interest rate 0.00%       2.344%
Senior Notes | 2.875% Senior notes due 2021          
Long-Term Debt          
Coupon rate, fixed rate notes 2.875% 2.875% 2.875%   2.875%
Total senior notes $ 0       $ 750
Effective interest rate 0.00%       2.993%
Senior Notes | 3.800% Senior notes due 2022          
Long-Term Debt          
Coupon rate, fixed rate notes 3.80%        
Total senior notes $ 750       $ 750
Effective interest rate 3.989%       3.989%
Senior Notes | 2.600% Senior notes due 2022          
Long-Term Debt          
Coupon rate, fixed rate notes 2.60%        
Total senior notes $ 1,000       $ 1,000
Effective interest rate 2.678%       2.678%
Senior Notes | 2.750% Senior notes due 2023          
Long-Term Debt          
Coupon rate, fixed rate notes 2.75%        
Total senior notes $ 750       $ 750
Effective interest rate 2.866%       2.866%
Senior Notes | 3.450% Senior notes due 2024          
Long-Term Debt          
Coupon rate, fixed rate notes 3.45%       3.45%
Total senior notes $ 750       $ 750
Effective interest rate 3.531%       3.531%
Senior Notes | 1.900% Senior notes due 2025          
Long-Term Debt          
Coupon rate, fixed rate notes 1.90%   1.90% 1.90%  
Total senior notes $ 800       $ 0
Effective interest rate 1.803%       0.00%
Senior Notes | 3.600% Senior notes due 2027          
Long-Term Debt          
Coupon rate, fixed rate notes 3.60%        
Total senior notes $ 850       $ 850
Effective interest rate 3.689%       3.689%
Senior Notes | 2.700% Senior notes due 2030          
Long-Term Debt          
Coupon rate, fixed rate notes 2.70%   2.70% 2.70%  
Total senior notes $ 950       $ 0
Effective interest rate 2.623%       0.00%
Senior Notes | 4.000% Senior notes due 2042          
Long-Term Debt          
Coupon rate, fixed rate notes 4.00%        
Total senior notes $ 750       $ 750
Effective interest rate 4.114%       4.114%
Senior Notes | 6.000% Senior notes due 2056          
Long-Term Debt          
Coupon rate, fixed rate notes 6.00%        
Total senior notes $ 750       $ 750
Effective interest rate 6.547%       6.547%