Offsetting Assets and Liabilities - Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives:
Gross Amounts of Recognized Liabilities	$ 4,959	$ 3,883
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	4,959	3,883
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(4,844)	(3,734)
Cash Collateral	0	(36)
Securities Collateral	(106)	(78)
Net Amount	9	35
Securities loaned
Gross Amounts of Recognized Liabilities	309	163
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	309	163
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(27)	(32)
Cash Collateral	0	0
Securities Collateral	(275)	(126)
Net Amount	7	5
Total
Gross Amounts of Recognized Liabilities	5,268	4,046
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	5,268	4,046
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(4,871)	(3,766)
Cash Collateral	0	(36)
Securities Collateral	(381)	(204)
Net Amount	16	40
OTC
Derivatives:
Gross Amounts of Recognized Liabilities	4,944	3,829
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	4,944	3,829
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(4,833)	(3,707)
Cash Collateral	0	(36)
Securities Collateral	(106)	(78)
Net Amount	5	8
OTC cleared
Derivatives:
Gross Amounts of Recognized Liabilities	8	35
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	8	35
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(4)	(9)
Cash Collateral	0	0
Securities Collateral	0	0
Net Amount	4	26
Exchange-traded
Derivatives:
Gross Amounts of Recognized Liabilities	7	19
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Amounts of Liabilities Presented in the Consolidated Balance Sheets	7	19
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(7)	(18)
Cash Collateral	0	0
Securities Collateral	0	0
Net Amount	$ 0	$ 1