Consolidated Statement of Income Parentheticals (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Total other-than-temporary impairment losses	$ 0	$ 0	$ (2)	$ (1)
Other-than-temporary impairment, credit losses recognized in net realized investment gains	0	0	(2)	(1)
Unrealized gains (losses) from other changes in total other-than-temporary impairments recognized in other comprehensive income (loss) as part of changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income	$ 0	$ 0	$ 0	$ 0