CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,104			$ 2,406			$ 9,965	$ 148
Other comprehensive income (loss), net of tax:
Net unrealized gains on securities available for sale	(208)			1			(1,305)	1,447
Net unrealized gains (losses) on hedging relationships	(195)			(175)			(827)	1,256
Foreign currency translation adjustments	(27)			28			1	(16)
Other	(2)			(2)			(3)	(2)
Other comprehensive income (loss), net of tax	(432)			(148)			(2,134)	2,685
Comprehensive income	$ 2,672	$ 3,545	$ 1,614	$ 2,258	$ (616)	$ 1,191	$ 7,831	$ 2,833