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Income Taxes - Total income tax provision (Details) - USD ($) $ in Millions	12 Months Ended
	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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