Variable Interest Entities - Summary of the Impact of Qualifying LIHTC Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
LIHTC credits and benefits, net of amortization	$ (14)	$ (9)	$ (4)
Low income housing tax credits
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	26	23	15
LIHTC credits and benefits, net of amortization	(32)	(22)	(14)
Other tax benefits related to qualifying LIHTC investments
Variable Interest Entity [Line Items]
LIHTC credits and benefits, net of amortization	$ (7)	$ (10)	$ (6)