Goodwill and Other Intangibles - Schedule of Changes in Intangible Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Finite-lived Intangible Liabilities [Roll Forward]
Balance at January 1	$ 0
Amortization	(4)
Balance at March 31, net of accumulated amortization	48
CIT Group Inc.
Finite-lived Intangible Liabilities [Roll Forward]
Acquired in CIT Merger	$ 52