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Income Taxes - Total income tax provision (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current taxes: |  |  |
Federal | $ 153 | $ 299 | $ 216
State | 6 | 12 | 8
Deferred taxes: |  |  |
Federal | 5 | (192) | (29)
Impact of change in U.S. corporate tax rate | 83 | 0 | 0
Total Federal deferred taxes | 88 | (192) | (29)
Provision for income taxes as shown in the Statement of Earnings | $ 247 | $ 119 | $ 195

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