Variable Interest Entities and Asset Securitizations - Schedule of Carrying Amount of Investments In Tax Equity Partnerships and Related Future Funding Commitments (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Accrued Interest and Other Assets [Member] | Affordable Housing Projects [member]
Investments in affordable housing projects:
Carrying amount	[1]	$ 1,323	$ 1,340
Accrued Interest and Other Assets [Member] | Renewable Energy [Member]
Investments in affordable housing projects:
Carrying amount	[1]	79	80
Accrued Interest and Other Assets [Member] | Other [Member]
Investments in affordable housing projects:
Carrying amount	[1]	40	41
Accrued Interest and Other Liabilities [Member] | Affordable Housing Projects [member]
Investments in affordable housing projects:
Amount of future funding commitments included in carrying amount	[2]	379	410
Contingent commitments		55	55
Accrued Interest and Other Liabilities [Member] | Renewable Energy [Member]
Investments in affordable housing projects:
Amount of future funding commitments included in carrying amount	[2]	$ 49	$ 31

[1] Included in "accrued interest and other assets" in the Consolidated Balance Sheet

[2] Included in "accrued interest and other liabilities" in the Consolidated Balance Sheet.