Variable Interest Entities - Aggregate Assets, Liabilities and Maximum Exposure to Loss from VIEs which Variable Interest is Held but not the Primary Beneficiary (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Aggregate assets	[1]	$ 493,178	$ 551,772
Aggregate liabilities	[1]	452,220	515,164
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Aggregate assets		1,586	1,261
Aggregate liabilities		759	619
Maximum exposure to loss		1,638	1,309
Variable Interest Entity, Not Primary Beneficiary | LIHTC investments
Variable Interest Entity [Line Items]
Aggregate assets		1,407	1,094
Aggregate liabilities		759	619
Maximum exposure to loss		1,407	1,094
Variable Interest Entity, Not Primary Beneficiary | Other investments
Variable Interest Entity [Line Items]
Aggregate assets		179	167
Aggregate liabilities		0	0
Maximum exposure to loss		$ 231	$ 215

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.