Income Taxes (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes on Continuing Operations (Table Amounts)
Current federal income tax expense (benefit)	$ 292	$ 449	$ 661
Deferred federal income tax expense (benefit)	213	907	(36)
Total federal income tax expense (benefit)	505	1,356	625
Current foreign income tax expense (benefit)	7	8	14
Deferred foreign income tax expense (benefit)	1	(4)	(1)
Total foreign income tax expense (benefit)	8	4	13
Total federal and foreign income tax expense	$ 513	$ 1,360	$ 638