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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Income tax |  |  |  |  |
Net UTB impacting the effective tax rate |  | $ 679 |  | $ 655 |
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis |  | 6 | $ 9 |  |
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis |  | 75 |  | 69 |
Deferred tax assets valuation allowance |  | $ 84 |  | $ 67 |
Effective tax rate (as a percent) |  | 17.90% | 37.20% |  |
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) |  | (19.30%) |  |  |
Statutory U.S. tax rate |  |  |  | 21.00% | 35.00%
Tax Cuts and Jobs Act of 2017 measurement period adjustment |  |  | $ 217 |  |
Retained Earnings | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  |  |  |
Income tax |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 900 |  |  |  |
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  |  |  |
Income tax |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 900 |  |  |  |

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- Definition Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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