Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Long-Term Debt
Long-term debt	$ 6,814	$ 6,777
Hedge accounting fair value adjustments	77	22
Other indebtedness	0	19
Short-term Debt
Other indebtedness	25	0
Short-term debt	625	850
Total Debt	$ 7,439	$ 7,627
Senior notes due 2015 \| Senior Notes
Long-Term Debt
Coupon rate, fixed rate notes	0.00%
Effective interest rate	0.82%	0.82%
Short-term Debt
Current maturities of long-term debt	$ 0	$ 250
Senior notes due 2015 \| Senior Notes
Long-Term Debt
Coupon rate, fixed rate notes	1.625%
Effective interest rate	1.805%	1.805%
Short-term Debt
Current maturities of long-term debt	$ 600	$ 600
Senior Notes
Long-Term Debt
Long-term debt	6,737	6,736
Senior Notes \| Senior notes due 2017
Long-Term Debt
Long-term debt	$ 450	$ 450
Effective interest rate	0.574%	0.56%
Senior Notes \| Senior notes due 2019
Long-Term Debt
Long-term debt	$ 400	$ 400
Effective interest rate	0.819%	0.811%
Senior Notes \| Senior notes due 2017
Long-Term Debt
Coupon rate, fixed rate notes	1.35%
Long-term debt	$ 1,000	$ 1,000
Effective interest rate	1.456%	1.456%
Senior Notes \| Senior notes due 2019
Long-Term Debt
Coupon rate, fixed rate notes	2.20%
Long-term debt	$ 1,148	$ 1,148
Effective interest rate	2.346%	2.346%
Senior Notes \| Senior notes due 2020
Long-Term Debt
Coupon rate, fixed rate notes	3.25%
Long-term debt	$ 499	$ 498
Effective interest rate	3.389%	3.389%
Senior Notes \| Senior notes due 2021
Long-Term Debt
Coupon rate, fixed rate notes	2.875%
Long-term debt	$ 749	$ 749
Effective interest rate	2.993%	2.993%
Senior Notes \| Senior notes due 2022
Long-Term Debt
Coupon rate, fixed rate notes	2.60%
Long-term debt	$ 999	$ 999
Effective interest rate	2.678%	2.678%
Senior Notes \| Senior notes due 2024
Long-Term Debt
Coupon rate, fixed rate notes	3.45%
Long-term debt	$ 749	$ 749
Effective interest rate	3.531%	3.531%
Senior Notes \| Senior notes due 2042
Long-Term Debt
Coupon rate, fixed rate notes	4.00%
Long-term debt	$ 743	$ 743
Effective interest rate	4.114%	4.114%
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%

Long-term Debt, Hedge Accounting, Fair Value Adjustment

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

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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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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer.

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