Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Foreign currency translation, Taxes	$ (14,000,000)	$ (62,000,000)	$ (20,000,000)	$ (55,000,000)
Change in net unrealized gains (losses) on available-for-sale securities, Taxes	4,000,000	53,000,000	171,000,000	263,000,000
Change in net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, Taxes	2,000,000	3,000,000	0	4,000,000
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, Taxes	0	0	0	1,000,000
Change in net unrealized gains (losses) on cash flow hedges, Taxes	8,000,000	3,000,000	55,000,000	12,000,000
Change in unrealized gains (losses) on retirement plans, Taxes	$ 0	$ 0	$ 5,000,000	$ (5,000,000)