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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income tax |  |  |  |  |  |  |
Net UTB impacting the effective tax rate |  | $ 718 |  |  | $ 718 |  | $ 655
Deferred tax assets valuation allowance |  | $ 97 |  |  | $ 97 |  | $ 67
Effective tax rate (as a percent) |  | 21.80% | 20.80% |  | 20.10% | 25.60% |
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) |  | 1.00% |  |  | (5.50%) |  |
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 |  |  |  |  |  |
Total 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 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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