Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt
Long-term debt	$ 10,050	$ 10,050	$ 9,000
Hedge accounting fair value adjustments		(2)	(23)
Unamortized discount and debt issuance costs		(68)	(64)
Current portion of long-term debt		750	1,450
Total long-term debt		9,234	7,509
Short-Term Debt
Current portion of long-term debt		750	1,450
Unamortized discount and debt issuance costs		0	(1)
Other indebtedness		31	2
Total short-term debt	$ 781	781	1,451
Total Debt		$ 10,015	$ 8,960
Senior Notes \| Senior notes due 2017
Long-Term Debt
Effective Interest Rate			1.223%
Long-term debt		$ 0	$ 450
Senior Notes \| Senior notes due 2019
Long-Term Debt
Effective Interest Rate		1.955%	1.46%
Long-term debt		$ 400	$ 400
Senior Notes \| Senior notes due 2023
Long-Term Debt
Effective Interest Rate		2.349%
Long-term debt		$ 400
Senior Notes \| Senior notes due 2017
Long-Term Debt
Coupon rate, fixed rate notes	1.35%	1.35%
Effective Interest Rate			1.456%
Long-term debt		$ 0	$ 1,000
Senior Notes \| Senior notes due 2018
Long-Term Debt
Coupon rate, fixed rate notes		2.50%	2.50%
Effective Interest Rate		2.775%	2.775%
Long-term debt		$ 750	$ 750
Senior Notes \| Senior notes due 2019
Long-Term Debt
Coupon rate, fixed rate notes		2.20%
Effective Interest Rate		2.346%	2.346%
Long-term debt		$ 1,150	$ 1,150
Senior Notes \| Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes		3.25%
Effective Interest Rate		3.389%	3.389%
Long-term debt		$ 500	$ 500
Senior Notes \| Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes	2.15%	2.15%
Effective Interest Rate		2.344%
Long-term debt		$ 500
Senior Notes \| Senior notes due 2021
Long-Term Debt
Coupon rate, fixed rate notes		2.875%
Effective Interest Rate		2.993%	2.993%
Long-term debt		$ 750	$ 750
Senior Notes \| Senior notes due 2022
Long-Term Debt
Coupon rate, fixed rate notes		3.80%	3.80%
Effective Interest Rate		3.989%	3.989%
Long-term debt		$ 750	$ 750
Senior Notes \| Senior notes due 2022
Long-Term Debt
Coupon rate, fixed rate notes		2.60%
Effective Interest Rate		2.678%	2.678%
Long-term debt		$ 1,000	$ 1,000
Senior Notes \| Senior notes due 2023
Long-Term Debt
Coupon rate, fixed rate notes	2.75%	2.75%
Effective Interest Rate		2.866%
Long-term debt		$ 750
Senior Notes \| Senior notes due 2024
Long-Term Debt
Coupon rate, fixed rate notes		3.45%
Effective Interest Rate		3.531%	3.531%
Long-term debt		$ 750	$ 750
Senior Notes \| Senior notes due 2027
Long-Term Debt
Coupon rate, fixed rate notes	3.60%	3.60%
Effective Interest Rate		3.689%
Long-term debt		$ 850
Senior Notes \| Senior notes due 2042
Long-Term Debt
Coupon rate, fixed rate notes		4.00%
Effective Interest Rate		4.114%	4.114%
Long-term debt		$ 750	$ 750
Senior Notes \| Senior notes due 2056
Long-Term Debt
Coupon rate, fixed rate notes		6.00%	6.00%
Effective Interest Rate		6.547%	6.547%
Long-term debt		$ 750	$ 750
LIBOR \| Senior Notes \| Senior notes due 2017
Long-Term Debt
Coupon rate, floating rate notes	0.20%
LIBOR \| Senior Notes \| Senior notes due 2019
Long-Term Debt
Coupon rate, floating rate notes	0.48%

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Noncurrent

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Amount of addition (reduction) to long-term debt, hedge accounting, fair value

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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