Employee Benefit Plans - Defined Benefit Plans Measured Using Significant Unobservable Inputs Level 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States Pension Plan of US Entity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning			$ 3,573
Fair Value of Plan Assets - ending	3,126	2,876	3,573
United States Pension Plan of US Entity [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	480	358
Purchases	45	178
Sales	(65)	(95)
Net transfers in from Level 1		0
Realized gains (losses)	34	70
Unrealized gains (losses)	28	(31)
Currency translation	0	0
Fair Value of Plan Assets - ending	522	480
United States Pension Plan of US Entity [Member] \| Fair Value, Inputs, Level 3 [Member] \| Real estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	29	58
Purchases	1	1
Sales	(6)	(36)
Net transfers in from Level 1		0
Realized gains (losses)	(7)	24
Unrealized gains (losses)	8	(18)
Currency translation	0	0
Fair Value of Plan Assets - ending	25	29
United States Pension Plan of US Entity [Member] \| Fair Value, Inputs, Level 3 [Member] \| Private equity funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	451	300
Purchases	44	177
Sales	(59)	(59)
Net transfers in from Level 1		0
Realized gains (losses)	41	46
Unrealized gains (losses)	20	(13)
Currency translation	0	0
Fair Value of Plan Assets - ending	497	451
Foreign Pension Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning			5,431
Fair Value of Plan Assets - ending	6,088	5,789	5,431
Foreign Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	616	466
Purchases	375	260
Sales	(89)	(133)
Net transfers in from Level 1		(1)
Realized gains (losses)	35	23
Unrealized gains (losses)	37	(21)
Currency translation	(67)	22
Fair Value of Plan Assets - ending	907	616
Foreign Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Real estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	269	332
Purchases	74	64
Sales	(64)	(128)
Net transfers in from Level 1		0
Realized gains (losses)	20	17
Unrealized gains (losses)	(1)	(21)
Currency translation	(19)	5
Fair Value of Plan Assets - ending	279	269
Foreign Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Private equity funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	212	3
Purchases	279	193
Sales	0	0
Net transfers in from Level 1		0
Realized gains (losses)	0	2
Unrealized gains (losses)	38	2
Currency translation	(30)	12
Fair Value of Plan Assets - ending	499	212
Foreign Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Guaranteed insurance contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	135	131
Purchases	22	3
Sales	(25)	(5)
Net transfers in from Level 1		(1)
Realized gains (losses)	15	4
Unrealized gains (losses)	0	(2)
Currency translation	(18)	5
Fair Value of Plan Assets - ending	$ 129	$ 135

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(B)

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- Definition

Amount of unrealized gain recognized in the income statement from investments for which net asset value per share is calculated on unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Benefit Plan Assets, Fair Value, Unobservable Inputs, Currency translation

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- Definition

Fair Value, Level 1 Net Transfers In (Out)

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