Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,944	$ 2,774	$ 2,693
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of ($19), $47 and $86, respectively	261	(441)	(413)
Net unrealized gains (losses) on investment securities, net of reclassification adjustment and net of related taxes of $335, ($650) and ($338), respectively	870	(1,767)	(896)
Net unrealized gains (losses) on cash flow hedges, net of related taxes of $85, ($133) and ($24), respectively	228	(357)	(59)
Net unrealized gains (losses) on retirement plans, net of related taxes of $0, ($1) and $16, respectively	(2)	(13)	48
Other comprehensive income (loss)	1,357	(2,578)	(1,320)
Total comprehensive income	$ 3,301	$ 196	$ 1,373