CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,536		$ (918)		$ 6,861	$ (2,258)
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale	51		222		(1,097)	1,446
Net unrealized gains (losses) on hedging relationships	(51)		57		(632)	1,431
Foreign currency translation adjustments	9		23		28	(44)
Other	0		0		(1)	0
Other comprehensive income (loss), net of tax	9		302		(1,702)	2,833
Comprehensive income (loss)	$ 3,545	$ 1,614	$ (616)	$ 1,191	$ 5,159	$ 575