Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,280	$ 257	$ 4,515	$ 624
Other comprehensive income (loss):
Net unrealized debt securities (losses) gains, net of tax	(11)	(5)	(23)	52
Foreign currency translation adjustments, net of tax	19	123	2	(199)
Net unrealized pension and other postretirement benefits, net of tax	9	(33)	35	(27)
Other comprehensive income (loss)	17	85	14	(174)
Comprehensive income	$ 2,297	$ 342	$ 4,529	$ 450