Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Less Than 1 Year	$ 139,878
1 - 5 Years	50,256
6 - 10 Years	34,523
11 - 30 Years	29,127
Over 30 Years	2,090
Total	255,874	$ 272,851
Interest rate contracts
Derivative [Line Items]
Less Than 1 Year	12,810
1 - 5 Years	18,418
6 - 10 Years	23,981
11 - 30 Years	27,267
Over 30 Years	0
Total	82,476
Foreign currency contracts
Derivative [Line Items]
Less Than 1 Year	199
1 - 5 Years	1,292
6 - 10 Years	1,776
11 - 30 Years	1,853
Over 30 Years	42
Total	5,162
Equity market contracts
Derivative [Line Items]
Less Than 1 Year	126,869
1 - 5 Years	30,374
6 - 10 Years	8,696
11 - 30 Years	7
Over 30 Years	2,048
Total	167,994
Credit contracts
Derivative [Line Items]
Less Than 1 Year	0
1 - 5 Years	172
6 - 10 Years	70
11 - 30 Years	0
Over 30 Years	0
Total	$ 242