CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 2,406			$ 1,333			$ 148	$ 4,370
Other comprehensive income (loss), net of tax:
Net unrealized gains on securities available for sale	1			100			1,447	664
Net unrealized gains (losses) on hedging relationships	(175)			189			1,256	1,003
Foreign currency translation adjustments	28			(12)			(16)	33
Net changes in securities held to maturity	0			8			0	20
Other	(2)			(2)			(2)	(4)
Other comprehensive income (loss), net of tax	(148)			283			2,685	1,716
Comprehensive income	$ 2,258	$ (616)	$ 1,191	$ 1,616	$ 2,455	$ 2,015	$ 2,833	$ 6,086