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Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 97 | $ 122 | $ 148 |  |  |
Additions based on current year tax positions | 3 | 3 | 3 |  |  |
Additions based on prior year tax positions | 7 | 0 | 7 |  |  |
Reductions based on prior year tax positions | 0 | 0 | (1) |  |  |
Reductions based on settlements with taxing authority | (73) | (22) | (26) |  |  |
Reductions due to lapse in statute of limitations | 0 | (2) | (9) |  |  |
Impact of the 2017 Tax Reform | 0 | (4) | 0 |  |  |
Balance at end of period | 34 | 97 | 122 |  |  |
Unrecognized Tax Benefits,Other Disclosure [Abstract] |  |  |  |  |  |
Income Tax Examination, Penalties and Interest Expense (Benefit) | (15) | (9) | 2 |  |  |
Income Tax Examination, Interest Accrued |  |  |  | $ 2 | $ 19 | $ 28
Income Tax Examination, Penalties Accrued |  |  |  | 1 | 0 |
Unrecognized Tax Benefits | $ 97 | $ 122 | $ 148 | 34 | $ 97 | $ 122
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | 21 |  |
Unrecognized tax benefits balance reasonably possible next year |  |  |  | $ 13 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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