CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 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)	$ 3
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held	(4)	3
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income	1	1
Tax expense (benefit) of defined benefit pension and other benefits plans	0	(16)
Tax expense (benefit) of defined benefit pension and other benefits plans reclassified from AOCI to net income	1	(1)
Tax expense (benefit) of other comprehensive income (loss) related to equity method investees	0	(1)
Tax benefit of disposal of a business	$ 19	$ 0