Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Total senior notes	$ 9,000	$ 9,000
Hedge accounting fair value adjustments	16	23
Unamortized discount and debt issuance costs	(60)	(64)
Less: Current portion of long-term debt	2,200	1,450
Total long-term debt	6,756	7,509
Current portion of long-term debt	(2,200)	(1,450)
Unamortized discount and debt issuance costs	(2)	(1)
Other indebtedness	12	2
Total short-term debt	2,210	1,451
Total Debt	8,966	8,960
Senior Notes \| Floating rate, Senior notes due 2017
Debt Instrument [Line Items]
Total senior notes	$ 450	$ 450
Effective interest rate	1.372%	1.223%
Senior Notes \| Floating rate, Senior notes due 2017 \| LIBOR
Debt Instrument [Line Items]
Coupon rate, variable rate notes	0.20%
Senior Notes \| Floating rate, Senior notes due 2019
Debt Instrument [Line Items]
Total senior notes	$ 400	$ 400
Effective interest rate	1.60%	1.46%
Senior Notes \| Floating rate, Senior notes due 2019 \| LIBOR
Debt Instrument [Line Items]
Coupon rate, variable rate notes	0.48%
Senior Notes \| 1.350% Senior notes due 2017
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.50%		2.50%
Total senior notes	$ 750	$ 750
Effective interest rate	2.775%	2.775%
Senior Notes \| 2.200% Senior notes due 2019
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	3.80%		3.80%
Total senior notes	$ 750	$ 750
Effective interest rate	3.989%	3.989%
Senior Notes \| 2.600% Senior notes due 2022
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	6.00%		6.00%
Total senior notes	$ 750	$ 750
Effective interest rate	6.547%	6.547%

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

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
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