Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total senior notes	$ 9,300	$ 10,050
Hedge accounting fair value adjustments	(37)	2
Unamortized discount and debt issuance costs	(62)	(68)
Less: Current portion of long-term debt	0	750
Total long-term debt	9,201	9,234
Current portion of long-term debt	0	(750)
Other indebtedness	3	31
Total short-term debt	3	781
Total Debt	9,204	10,015
Senior Notes \| Floating rate, Senior notes due 2019
Debt Instrument [Line Items]
Total senior notes	$ 400	$ 400
Effective interest rate	2.838%	1.955%
Senior Notes \| Floating rate, Senior notes due 2019 \| LIBOR
Debt Instrument [Line Items]
Coupon rate, variable rate notes	0.48%
Senior Notes \| Floating rate, Senior notes due 2023
Debt Instrument [Line Items]
Total senior notes	$ 400	$ 400
Effective interest rate	3.229%	2.349%
Senior Notes \| Floating rate, Senior notes due 2023 \| LIBOR
Debt Instrument [Line Items]
Coupon rate, variable rate notes	0.87%
Senior Notes \| 2.500% Senior notes due 2018
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.50%
Total senior notes	$ 0	$ 750
Effective interest rate		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 \| 2.150% Senior notes due 2020
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.15%
Total senior notes	$ 500	$ 500
Effective interest rate	2.344%	2.344%
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%
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 \| 2.750% Senior notes due 2023
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.75%
Total senior notes	$ 750	$ 750
Effective interest rate	2.866%	2.866%
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 \| 3.600% Senior notes due 2027
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	3.60%
Total senior notes	$ 850	$ 850
Effective interest rate	3.689%	3.689%
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%
Total senior notes	$ 750	$ 750
Effective interest rate	6.547%	6.547%

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

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- Definition

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

+ References

No definition available.

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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
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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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- Definition

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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- 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, 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
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