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Income Taxes Income Taxes (Components of Deferred Income Tax) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | $ (14) | $ (353) | $ (18)
Deferred Benefit [Member] |  |  |
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 14 | 254 | 48
Tax reserves and allowances on current year activity [Member] |  |  |
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | (20) | (210) | (39)
Tax reserves and allowances on beginning of the year balances [Member] [Member] |  |  |
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 0 | (320) | (9)
Unremitted foreign earnings [Member] |  |  |
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 0 | (77) | (5)
U.K. statutory rate change [Member] |  |  |
Components of Deferred Tax Expense [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | $ (8) | $ 0 | $ (13)

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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