Variable Interest Entities - Schedule of Variable Interest Entities Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total Assets	$ 187,485	$ 188,281
Total Liabilities	172,938	173,644
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	1,032	1,149
Total Liabilities	1	1
Variable Interest Entity, Not Primary Beneficiary | LIHTC investments
Variable Interest Entity [Line Items]
Total Assets	8,880	8,904
Total Liabilities	3,841	3,848
Maximum Exposure to Loss	2,623	2,768
Variable Interest Entity, Not Primary Beneficiary | Indirect investments
Variable Interest Entity [Line Items]
Total Assets	2,625	2,741
Total Liabilities	91	91
Maximum Exposure to Loss	$ 18	$ 18