Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Assets
Derivative Assets, Gross	$ 313	$ 280
Liabilities
Derivative Liabilities, Gross	478	514
Asset, Formerly Accounted for as a Derivative, to be Amortized into Earnings	153	161
Liability, Formerly Accounted for as a Derivative, to be Amortized into Earnings	173	180
Subject to netting arrangement [Member]
Assets
Derivative Assets, Gross	36	53
Derivative Assets Not Offset Under Netting Arrangements	(11)	(10)
Derivative Assets Not Offset By Collateral	0	0
Derivative Assets, Net	25	43
Liabilities
Derivative Liabilities, Gross	425	507
Derivative Liabilities Not Offset Under Netting Arrangements	(11)	(10)
Derivative Liabilities Not Offset By Collateral	(31)	(26)
Derivative Liabilities, Net	383	471
Current [Member]
Assets
Derivative Assets, Gross	91	77
Liabilities
Derivative Liabilities, Gross	151	148
Noncurrent [Member]
Assets
Derivative Assets, Gross	222	203
Liabilities
Derivative Liabilities, Gross	327	366
Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	38	31
Liabilities
Derivative Liabilities, Gross	444	490
Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	275	249
Liabilities
Derivative Liabilities, Gross	34	24
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross	369	416
Interest Rate Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	369	416
Interest Rate Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	0	0
Cross currency derivatives [Member]
Liabilities
Derivative Liabilities, Gross	32	29
Cross currency derivatives [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	32	29
Cross currency derivatives [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	0	0
Foreign Exchange Contract [Member]
Assets
Derivative Assets, Gross	251	236
Liabilities
Derivative Liabilities, Gross	53	52
Foreign Exchange Contract [Member] \| Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	7	6
Liabilities
Derivative Liabilities, Gross	32	38
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	244	230
Liabilities
Derivative Liabilities, Gross	21	14
Commodity Contract [Member]
Assets
Derivative Assets, Gross	62	44
Liabilities
Derivative Liabilities, Gross	24	17
Commodity Contract [Member] \| Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	31	25
Liabilities
Derivative Liabilities, Gross	11	7
Commodity Contract [Member] \| Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross	31	19
Liabilities
Derivative Liabilities, Gross	$ 13	$ 10

Asset, Formerly Accounted for as a Derivative, to be Amortized into Earnings

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Represents the fair value of derivative assets that could have been offset under master netting arrangements but were not, in accordance with company policy.

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Represents the fair value of derivative liabilities that could have been offset under master netting arrangements but were not, in accordance with company policy.

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Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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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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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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