Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Long-Term Debt
Hedge accounting fair value adjustments	$ 104	$ 41
Unamortized discount and debt issuance costs	(74)	(42)
Total long-term debt	9,030	6,749
Short-Term Debt
Other indebtedness	6	0
Short-term debt	6	0
Total Debt	9,036	6,749
Senior Notes
Long-Term Debt
Total senior notes	9,000	6,750
Senior Notes \| Floating rate, Senior notes due 2017
Long-Term Debt
Total senior notes	$ 450	$ 450
Effective interest rate	0.651%	0.586%
Senior Notes \| Floating rate, Senior notes due 2019
Long-Term Debt
Total senior notes	$ 400	$ 400
Effective interest rate	0.853%	0.825%
Senior Notes \| 1.350% Senior notes due 2017
Long-Term Debt
Coupon rate, fixed rate notes	1.35%
Total senior notes	$ 1,000	$ 1,000
Effective interest rate	1.456%	1.456%
Senior Notes \| 2.500% Senior notes due 2018
Long-Term Debt
Coupon rate, fixed rate notes	2.50%
Total senior notes	$ 750	$ 0
Effective interest rate	2.775%	0.00%
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 \| 2.875% 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	$ 0
Effective interest rate	3.989%	0.00%
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 \| 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 \| 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	$ 0
Effective interest rate	6.547%	0.00%
LIBOR \| Senior Notes \| Floating rate, Senior notes due 2017
Long-Term Debt
Coupon rate, floating rate notes	0.20%
LIBOR \| Senior Notes \| Floating rate, Senior notes due 2019
Long-Term Debt
Coupon rate, floating rate notes	0.48%

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

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

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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- Definition

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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