Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 2,276	$ 1,139	$ 3,799	$ 2,690
Other comprehensive income, net of tax:
Change in net unrealized losses/gains on investments	730	238	41	595
Change in non-credit component of impairment losses on investments	10	(1)	(22)	(1)
Change in net unrealized gains/losses on cash flow hedges	3	0	6	3
Change in net periodic pension and postretirement costs	10	3	17	6
Foreign currency translation adjustments	1	0	0	0
Other comprehensive income	754	240	42	603
Total comprehensive income	$ 3,030	$ 1,379	$ 3,841	$ 3,293