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Income Taxes Unrecognized Tax Benefits (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Required minimum likelihood for benefits to be recognized in the financial statements |  |  |  | 50.00% |  |
Balance at beginning of year | $ 122,000,000 | $ 148,000,000 | $ 189,000,000 |  |  |
Additions based on current year tax positions | 3,000,000 | 3,000,000 | 4,000,000 |  |  |
Additions based on prior year tax positions | 0 | 7,000,000 | 0 |  |  |
Reductions based on prior year tax positions | 0 | (1,000,000) | (6,000,000) |  |  |
Reductions based on settlements with taxing authority | (22,000,000) | (26,000,000) | (25,000,000) |  |  |
Reductions due to lapse in statute of limitations | (2,000,000) | (9,000,000) | (14,000,000) |  |  |
Impact of the 2017 Tax Reform | (4,000,000) | 0 | 0 |  |  |
Balance at end of year | 97,000,000 | 122,000,000 | 148,000,000 |  |  |
Unrecognized Tax Benefits,Other Disclosure [Abstract] |  |  |  |  |  |
Income Tax Examination, Penalties and Interest Expense | (9,000,000) | 2,000,000 | (4,000,000) |  |  |
Income Tax Examination, Interest Accrued |  |  |  | $ 19,000,000 | $ 28,000,000 | $ 24,000,000
Income Tax Examination, Penalties Accrued |  |  |  | 0 | 0 | 2,000,000
Unrecognized Tax Benefits | $ 122,000,000 | $ 148,000,000 | $ 189,000,000 | 97,000,000 | $ 122,000,000 | $ 148,000,000
Increase in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | 6,000,000 |  |
Unrecognized tax benefits balance reasonably possible next year |  |  |  | $ 91,000,000 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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