Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Less Than 1 Year	$ 197,247
1 – 5 Years	63,597
6 - 10 Years	30,986
11 - 30 Years	24,571
Over 30 Years	7,917
Total	324,318	$ 257,459
Interest rate contracts
Derivative [Line Items]
Less Than 1 Year	22,166
1 – 5 Years	25,350
6 - 10 Years	22,349
11 - 30 Years	22,530
Over 30 Years	1,213
Total	93,608
Foreign currency contracts
Derivative [Line Items]
Less Than 1 Year	276
1 – 5 Years	956
6 - 10 Years	1,687
11 - 30 Years	2,032
Over 30 Years	42
Total	4,993
Equity market contracts
Derivative [Line Items]
Less Than 1 Year	174,805
1 – 5 Years	37,200
6 - 10 Years	6,950
11 - 30 Years	9
Over 30 Years	6,662
Total	225,626
Credit contracts
Derivative [Line Items]
Less Than 1 Year	0
1 – 5 Years	91
6 - 10 Years	0
11 - 30 Years	0
Over 30 Years	0
Total	$ 91