CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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)	$ 3
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held	6	3	2	6
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income	0	(1)	1	1
Tax expense (benefit) of defined benefit pension and other benefits plans	0	(1)	0	(16)
Tax expense (benefit) of defined benefit pension and other benefits plans reclassified from AOCI to net income	(1)	0	(1)	(1)
Tax expense (benefit) of other comprehensive income (loss) related to equity method investees	0	1	0	0
Tax benefit of disposal of a business	$ 0	$ 0	$ (19)	$ 0