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Income Taxes Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 10 |  |
Uncertain Tax Positions More Likely Than Not Largest Amount of Benefit Percentage | 50.00% |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | $ 224 | $ 180 | $ 43
Additions related to current year | 33 | 51 | 94
Additions related to prior year | 65 | 40 | 67
Reductions related to prior year | (19) | (31) | (15)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 78 | 15 | 8
Settlements | (16) | (1) | (1)
Balance at end of period | 209 | 224 | 180
Income Tax Uncertainties [Abstract] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 203 | 159 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Write off of Related Deferred Tax Asset | 18 | 85 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 12 | 21 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense (Benefit) | (7) | $ 5 | $ 5
Tax Year 2018 [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | $ 60 |  |

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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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