Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Foreign currency translation, Taxes	$ (10,000,000)	$ (3,000,000)
Change in net unrealized gains (losses) on available-for-sale securities, Taxes	35,000,000	108,000,000
Change in net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, Taxes	(3,000,000)	(1,000,000)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, Taxes	0	(1,000,000)
Change in net unrealized gains (losses) on cash flow hedges, Taxes	44,000,000	9,000,000
Change in unrealized gains (losses) on retirement plans, Taxes	$ 4,000,000	$ (4,000,000)