Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 694	$ 587	$ 1,328	$ 1,095
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes	152	42	(148)	16
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes	327	257	461	529
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes	3	5	(4)	3
Non-credit impairment on held-to-maturity securities previously identified under ASC 320, net of related taxes	0	1	0	1
Net unrealized gains (losses) on cash flow hedges, net of related taxes	6	1	123	25
Net unrealized gains (losses) on retirement plans, net of related taxes	2	0	14	(8)
Other comprehensive income	490	306	446	566
Total comprehensive income	$ 1,184	$ 893	$ 1,774	$ 1,661