Schedule II - Valuation Accounts and Reserves (Details) - Valuation Accounts And Reserves (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation Allowance [Line Items]
Balance at beginning of period	$ 28	$ 26	$ 19
Additions	19	2	7
Balance at end of period	47	28	26
Valuation Allowance of Deferred Tax Assets [Member]
Valuation Allowance [Line Items]
Balance at beginning of period	286	210	219
Additions	186	80	10
Net deductions and other	174	4	19
Balance at end of period	298	286	210
Accumulated Amortization of Purchased Intangible Assets [Member]
Valuation Allowance [Line Items]
Balance at beginning of period	185	154	135
Additions	31	31	19
Balance at end of period	216	185	154
Business Restructuring Reserves [Member]
Valuation Allowance [Line Items]
Balance at beginning of period	44	42	10
Additions	49	41	52
Net deductions and other	49	39	20
Balance at end of period	$ 44	$ 44	$ 42

Total of the additions in a given period to allowances and reserves.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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