Estimates, Significant Accounting Policies and Balance Sheet Detials (Intangible assets) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Gross Carrying Amount	$ 5,012	$ 6,023
Accumulated Amortization	(591)	(497)
Customer relationships, contracts and agreements (3 to 46 years) [Member]
Gross Carrying Amount	4,601	5,067
Accumulated Amortization	(554)	(464)
Patents (9 years) [Member]
Gross Carrying Amount	48	48
Accumulated Amortization	(16)	(11)
Trade Names [Member]
Gross Carrying Amount	66	556
Accumulated Amortization	(18)	(15)
Other Amortizable Intangible Assets [Member]
Gross Carrying Amount	6	36
Accumulated Amortization	(3)	(7)
Total Amortizable Intangible Assets [Member]
Gross Carrying Amount	4,721	5,707
Accumulated Amortization	(591)	(497)
Non-amortizable intangible assets - Trademarks [Member]
Gross Carrying Amount	291	316
Accumulated Amortization	$ 0	$ 0
Maximum [Member] \| Customer relationships, contracts and agreements (3 to 46 years) [Member]
Useful Lives	46 years
Maximum [Member] \| Patents (9 years) [Member]
Useful Lives	9 years
Maximum [Member] \| Trade Names [Member]
Useful Lives	15 years
Maximum [Member] \| Other Amortizable Intangible Assets [Member]
Useful Lives	15 years
Minimum [Member] \| Customer relationships, contracts and agreements (3 to 46 years) [Member]
Useful Lives	3 years
Minimum [Member] \| Other Amortizable Intangible Assets [Member]
Useful Lives	1 year

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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