Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Long-Term Debt
Long-term debt	$ 6,779	$ 6,777
Hedge accounting fair value adjustments	41	22
Other indebtedness	0	19
Short-Term Debt
Total short-term debt	0	850
Total Debt	$ 6,779	$ 7,627
Senior notes due 2015 \| Senior Notes
Long-Term Debt
Coupon rate, fixed rate notes	0.70%
Effective Interest Rate	0.00%	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	0.00%	1.805%
Short-Term Debt
Current maturities of long-term debt	$ 0	$ 600
Senior Notes
Long-Term Debt
Long-term debt	6,738	6,736
Senior Notes \| Senior notes due 2017
Long-Term Debt
Long-term debt	$ 450	$ 450
Effective Interest Rate	0.586%	0.56%
Senior Notes \| Senior notes due 2019
Long-Term Debt
Long-term debt	$ 400	$ 400
Effective Interest Rate	0.825%	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	$ 744	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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