Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Long-Term Debt
Total senior notes	$ 9,300	$ 9,300
Hedge accounting fair value adjustments	23	(10)
Unamortized discount and debt issuance costs	(49)	(55)
Other long-term borrowings	19
Current portion of long-term debt	(2,050)	(1,550)
Total long-term debt	7,243	7,685
Short-Term Debt
Hedge accounting fair value adjustments	(1)	(7)
Unamortized discount and debt issuance costs	(1)	(1)
Other short-term borrowings	15	4
Total short-term debt	2,063	1,546
Total Debt	9,306	9,231
Senior Notes \| Floating rate, Senior notes due 2019
Long-Term Debt
Total senior notes	$ 400	$ 400
Effective interest rate	3.161%	3.123%
Senior Notes \| Floating rate, Senior notes due 2019 \| LIBOR
Long-Term Debt
Variable rate	0.48%
Senior Notes \| Floating rate, Senior notes due 2023
Long-Term Debt
Total senior notes	$ 400	$ 400
Effective interest rate	3.562%	3.499%
Senior Notes \| Floating rate, Senior notes due 2023 \| LIBOR
Long-Term Debt
Variable rate	0.87%
Senior Notes \| 2.200% Senior notes due 2019
Long-Term Debt
Coupon rate, fixed rate notes	2.20%
Total senior notes	$ 1,150	$ 1,150
Effective interest rate	2.346%	2.346%
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 \| 2.150% Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes	2.15%
Total senior notes	$ 500	$ 500
Effective interest rate	2.344%	2.344%
Senior Notes \| 2.875% Senior notes due 2021
Long-Term Debt
Coupon rate, fixed rate notes	2.875%
Total senior notes	$ 750	$ 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%
Total senior notes	$ 750	$ 750
Effective interest rate	3.531%	3.531%
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 \| 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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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Noncurrent

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