Variable Interest Entities - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) investment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Variable Interest Entity
Assets	$ 208,657		$ 207,452
LLCs designed for the purpose of purchasing pools of residual interests in leases
Variable Interest Entity
Number of co-investments | investment	3
Ownership percentage (more than)	50.00%
Variable Interest Entity, Not Primary Beneficiary | Loans provided to VIEs
Variable Interest Entity
Unfunded commitment amounts	$ 2,100		2,100
Variable Interest Entity, Not Primary Beneficiary | CDC investments
Variable Interest Entity
Assets	1,886		1,856
Variable Interest Entity, Not Primary Beneficiary | CDC investments | Qualified Affordable Housing Tax Credits
Variable Interest Entity
Assets	1,600		1,600
Unfunded commitments in qualifying LIHTC investments	$ 679		643
Variable Interest Entity, Not Primary Beneficiary | CDC investments | Qualified Affordable Housing Tax Credits | Minimum
Variable Interest Entity
Unfunded commitments, year expected to be funded	2023
Variable Interest Entity, Not Primary Beneficiary | CDC investments | Qualified Affordable Housing Tax Credits | Maximum
Variable Interest Entity
Unfunded commitments, year expected to be funded	2040
Variable Interest Entity, Not Primary Beneficiary | Private equity investments
Variable Interest Entity
Assets	$ 187		186
Unfunded commitment amounts	173		$ 163
Capital contribution to private equity investments	$ 12	$ 9