Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Long-Term Debt
Total senior notes	$ 6,605	$ 7,750
Hedge accounting fair value adjustments	10	10
Unamortized premium/(discount) and debt issuance costs	(12)	(20)
Other long-term borrowings	2	5
Current portion of long-term debt	(750)	0
Total long-term debt	5,855	7,745
Short-Term Debt
Current portion of long-term debt	750	0
Commercial paper	400	0
Other short-term borrowings	22	18
Total short-term debt	1,172	18
Total Debt	7,027	7,763
Senior Notes \| Floating rate, Senior notes due 2023
Long-Term Debt
Total senior notes	$ 400	$ 400
Effective interest rate	1.184%	1.187%
Senior Notes \| Floating rate, Senior notes due 2023 \| LIBOR
Long-Term Debt
Variable rate	0.87%
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	$ 605	$ 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%
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%
Total senior notes	$ 800	$ 800
Effective interest rate	1.803%	1.803%
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%
Total senior notes	$ 950	$ 950
Effective interest rate	2.623%	2.623%
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	$ 0	$ 750
Effective interest rate	0.00%	6.547%

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