Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease net ROU assets	$ 31	$ 37
Present value of lease liabilities	$ 43	$ 51
Operating lease, right-of-use asset, statement of financial position [extensible enumeration]	Other assets	Other assets
Operating lease, liability, statement of financial position [extensible enumeration]	Other liabilities	Other liabilities
Net lease expense	$ 33	$ 28	$ 36