Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Fair Value of Plan Assets at beginning of year	$ 1,264
Fair Value of Plan Assets at end of year	1,209	$ 1,264
Level 3
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Fair Value of Plan Assets at beginning of year	144
Fair Value of Plan Assets at end of year	142	144
Real Estate Trust Funds
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Fair Value of Plan Assets at beginning of year	41
Fair Value of Plan Assets at end of year	39	41
Real Estate Trust Funds \| Level 3
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Actual Return on Plan Assets Still Held at the Reporting Date	(3)	(2)
Purchases, Sales, and Settlements	2	1
Foreign currency translation and other	(1)	(3)
Fair Value of Plan Assets at beginning of year	41	45
Fair Value of Plan Assets at end of year	39	41
Hedge Funds
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Fair Value of Plan Assets at beginning of year	102
Fair Value of Plan Assets at end of year	102	102
Hedge Funds \| Level 3
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Actual Return on Plan Assets Still Held at the Reporting Date	5	9
Purchases, Sales, and Settlements	0	7
Foreign currency translation and other	(5)	(4)
Fair Value of Plan Assets at beginning of year	102	90
Fair Value of Plan Assets at end of year	102	102
Insurance Contracts
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Fair Value of Plan Assets at beginning of year	1
Fair Value of Plan Assets at end of year	1	1
Insurance Contracts \| Level 3
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Actual Return on Plan Assets Still Held at the Reporting Date	0	0
Purchases, Sales, and Settlements	0	(3)
Foreign currency translation and other	0	0
Fair Value of Plan Assets at beginning of year	1	4
Fair Value of Plan Assets at end of year	$ 1	$ 1

Total Increase or Decrease in the plan assets due to currency translation.

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- References

No definition available.

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- Definition

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

+ 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)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&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)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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- Definition

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.

+ References

Reference 1: 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=49178875&loc=d3e12355-114930

Reference 2: 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=58740216&loc=d3e1928-114920

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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=58740216&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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