CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Tax expense (benefit) on cash flow hedges reclassified from AOCI to net income	$ (1)	$ 1	$ (2)	$ 5
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held	1	2	3	8
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income	1	(1)	1	(1)
Tax expense (benefit) of defined benefit pension and other benefits plans	0	0	0	(16)
Tax expense (benefit) of defined benefit pension and other benefits plans reclassified from AOCI to net income	(1)	(1)	(1)	(1)
Tax expense (benefit) of other comprehensive income (loss) related to equity method investees	0	1	0	1
Tax benefit of disposal of a business	$ 0	$ 0	$ (19)	$ 0