Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 209	$ 350	$ 510	$ 763
Other comprehensive income (loss):
Net change in unrealized gains (losses) on non-credit impaired available-for-sale securities	(79)	17	(183)	(25)
Foreign currency translation adjustments	(4)	1	(3)	3
Other	7	(12)	20	11
Income tax effect:
Net change in unrealized gains (losses) on non-credit impaired available-for-sale securities	18	(4)	42	6
Foreign currency translation adjustments	1	0	1	0
Other	(2)	3	(5)	(3)
Other comprehensive income (loss), net of tax, before reclassification adjustments	(59)	5	(128)	(8)
Net realized losses on available-for-sale securities, net of tax	0	0	(3)	(1)
Reclassification adjustments included in net income, net of tax	0	0	(3)	(1)
Other comprehensive income (loss), net of tax	(59)	5	(131)	(9)
Comprehensive income	$ 150	$ 355	$ 379	$ 754