Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Long-Term Debt
Total senior notes	$ 8,671		$ 7,750
Hedge accounting fair value adjustments	12		15
Unamortized premium/(discount) and debt issuance costs	(33)		(44)
Other long-term borrowings	11		17
Current portion of long-term debt	(500)		(1,000)
Total long-term debt	8,161		6,738
Short-Term Debt
Current portion of long-term debt	500		1,000
Unamortized premium/(discount) and debt issuance costs	0		(1)
Other short-term borrowings	16		23
Total short-term debt	516		1,022
Total Debt	8,677		7,760
Senior Notes \| Floating rate, Senior notes due 2023
Long-Term Debt
Total senior notes	$ 400		$ 400
Effective interest rate	1.734%		2.913%
Senior Notes \| Floating rate, Senior notes due 2023 \| LIBOR
Long-Term Debt
Variable rate	0.87%
Senior Notes \| 2.150% Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes	2.15%
Total senior notes	$ 0		$ 500
Effective interest rate	0.00%		2.344%
Senior Notes \| 3.250% Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes	3.25%
Total senior notes	$ 500		$ 500
Effective interest rate	3.389%		3.389%
Senior Notes \| 2.875% Senior notes due 2021
Long-Term Debt
Coupon rate, fixed rate notes	2.875%		2.875%
Total senior notes	$ 421		$ 750
Effective interest rate	2.993%		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%
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%
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%

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