Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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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No definition available.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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Fair value of all derivative assets designated as hedges of net investment in foreign operations.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The cash inflow from borrowings supported by a written promise to pay an obligation that is uncollateralized (where debt is not backed by the pledge of collateral).

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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Ineffectiveness on net investment hedges	$ 0
Unrealized gains (losses) on designated hedges	20	$ (9)	$ 6
Senior Unsecured Notes 3.375% due 2024
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from Unsecured Notes Payable	600
Foreign currency exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	3,899	4,950
Foreign currency exchange forward contracts \| Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	41	68
Foreign currency exchange forward contracts \| Other noncurrent assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	4	1
Foreign currency exchange forward contracts \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of designated net investment hedges	48
Gains on derivatives designated as hedges	1	17
Notional amount	1,058	889
Foreign currency exchange forward contracts \| Designated as Hedging Instrument \| Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	24	27
Foreign currency exchange forward contracts \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	4	1
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Interest Rate Swap [Member] \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on designated hedges	7
Interest Rate Swap [Member] \| Other noncurrent assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Asset	9	15
Interest Rate Swap [Member] \| Other noncurrent liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	48
Interest Rate Swap [Member] \| Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Fair Value, Gross Liability	9	15
Interest Rate Swap [Member] \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	600
Interest Rate Swap [Member] \| Designated as Hedging Instrument \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 500	$ 500