Leases - Lease activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases	$ 41	$ 47	$ 46
Short-term leases	0	0	1
Total lease expense included in other expenses	41	47	47
Sublease income	(2)	0	0
Total lease expense, net of sublease income	$ 39	$ 47	$ 47