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Income Taxes - Total income tax provision (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current taxes: |  |  |
Federal | $ 196 | $ 153 | $ 299
State | 8 | 6 | 12
Deferred taxes: |  |  |
Federal | (82) | 5 | (192)
Impact of change in U.S. corporate tax rate | 0 | 83 | 0
Total Federal deferred taxes | (82) | 88 | (192)
Provision for income taxes as shown in the Statement of Earnings | $ 122 | $ 247 | $ 119

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