Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Long-Term Debt
Long-term debt	$ 9,000	$ 6,750
Hedge accounting fair value adjustments	(23)	(41)
Unamortized discount and debt issuance costs	(64)	(42)
Current portion of long-term debt	1,450	0
Total long-term debt	7,509	6,749
Short-Term Debt
Current portion of long-term debt	1,450	0
Unamortized discount and debt issuance costs	(1)	0
Other indebtedness	2	0
Total short-term debt	1,451	0
Total Debt	$ 8,960	$ 6,749
Senior Notes \| Senior notes due 2017
Long-Term Debt
Effective Interest Rate	1.223%	0.586%
Long-term debt	$ 450	$ 450
Senior Notes \| Senior notes due 2019
Long-Term Debt
Effective Interest Rate	1.46%	0.825%
Long-term debt	$ 400	$ 400
Senior Notes \| Senior notes due 2017
Long-Term Debt
Coupon rate, fixed rate notes	1.35%
Effective Interest Rate	1.456%	1.456%
Long-term debt	$ 1,000	$ 1,000
Senior Notes \| Senior notes due 2018
Long-Term Debt
Coupon rate, fixed rate notes	2.50%
Effective Interest Rate	2.775%	0.00%
Long-term debt	$ 750	$ 0
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 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%
Effective Interest Rate	3.989%	0.00%
Long-term debt	$ 750	$ 0
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 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 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%
Effective Interest Rate	6.547%	0.00%
Long-term debt	$ 750	$ 0
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%

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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