Employee Benefit Plans - Defined Benefit Plans Measured Using Significant Unobservable Inputs Level 3 (Details) - Pension Plan [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	$ 8,158
Fair Value of Plan Assets - ending	9,532	$ 8,158
Domestic Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	2,774	2,806
Fair Value of Plan Assets - ending	3,224	2,774
Domestic 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	12	17
Purchases	0	0
Transfers out of Level 3	(7)
Sales	(5)	(3)
Realized gains	(9)	0
Unrealized gains (losses)	9	(2)
Currency translation	0	0
Fair Value of Plan Assets - ending	0	12
Foreign Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets -beginning	5,384	5,353
Fair Value of Plan Assets - ending	6,308	5,384
Foreign 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	231	269
Purchases	1	5
Transfers out of Level 3	0
Sales	(2)	(26)
Realized gains	(1)	7
Unrealized gains (losses)	(24)	(12)
Currency translation	39	(12)
Fair Value of Plan Assets - ending	244	231
Foreign 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	121	145
Purchases	1	1
Transfers out of Level 3	0
Sales	0	(13)
Realized gains	(1)	6
Unrealized gains (losses)	7	(5)
Currency translation	9	(13)
Fair Value of Plan Assets - ending	137	121
Foreign 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	6	4
Purchases	0	2
Transfers out of Level 3	0
Sales	0	(1)
Realized gains	0	0
Unrealized gains (losses)	(16)	(4)
Currency translation	17	5
Fair Value of Plan Assets - ending	7	6
Foreign 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	104	120
Purchases	0	2
Transfers out of Level 3	0
Sales	(2)	(12)
Realized gains	0	1
Unrealized gains (losses)	(15)	(3)
Currency translation	13	(4)
Fair Value of Plan Assets - ending	$ 100	$ 104

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements.

+ 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)(5)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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.

+ 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=66048111&loc=d3e19207-110258

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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=66048111&loc=d3e19207-110258

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

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

+ References

No definition available.

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