Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 583	$ 764	$ 1,678	$ 2,156
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes	(264)	(57)	(248)	(244)
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes	136	(204)	665	(475)
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes	10	6	13	29
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes	1	2	2	1
Net unrealized gains (losses) on cash flow hedges, net of related taxes	7	30	32	(27)
Net unrealized gains (losses) on retirement plans, net of related taxes	(1)	0	(9)	14
Other comprehensive income (loss)	(111)	(223)	455	(702)
Total comprehensive income	$ 472	$ 541	$ 2,133	$ 1,454