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Schedule II - Valuation Accounts and Reserves (Details) - Valuation Accounts and Reserves - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | $ 47 | $ 28 | $ 26
Additions | 1 | 19 | 2
Balance at end of period | 48 | 47 | 28
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | 298 | 286 | 210
Additions | 30 | 186 | 80
Net deductions and other | 90 | 174 | 4
Balance at end of period | 238 | 298 | 286
Accumulated Amortization of Purchased Intangible Assets [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | 216 | 185 | 154
Additions | 49 | 31 | 31
Balance at end of period | 265 | 216 | 185
Business Restructuring Reserves [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | 44 | 44 | 42
Additions |  | 49 | 41
Net deductions and other | 41 | 49 | 39
Balance at end of period | $ 3 | $ 44 | $ 44

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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 + Details
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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 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 + Details
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