Derivative Instruments - Gross and Net Information About Financial Instruments Subject to Master Netting Arrangements (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Freestanding derivative assets
Gross Amounts Recognized	$ 226,000,000	$ 390,000,000
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	226,000,000	390,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	101,000,000	273,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	115,000,000	108,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	0	0
Net Amount	10,000,000	9,000,000
Freestanding derivative liabilities
Gross Amounts Recognized	900,000,000	1,210,000,000
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	900,000,000	1,210,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	101,000,000	273,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	0	6,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	791,000,000	744,000,000
Net Amount	8,000,000	187,000,000
Securities loaned
Gross Amounts Recognized	15,000,000	19,000,000
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	15,000,000	19,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	15,000,000	19,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	0	0
Net Amount	0	0
Repurchase agreements
Gross Amounts Recognized	1,782,000,000	0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	1,782,000,000	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	1,782,000,000	0
Net Amount	0	0
Repurchase agreements - collateral upgrade
Gross Amounts Recognized	1,487,000,000	0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(1,487,000,000)
Net Amounts Presented in the Condensed Consolidated Balance Sheets	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	0
Net Amount	0
Total financial liabilities
Gross Amounts Recognized	4,184,000,000	1,229,000,000
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(1,487,000,000)	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	2,697,000,000	1,229,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	101,000,000	273,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral	15,000,000	25,000,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Securities Collateral	2,573,000,000	744,000,000
Net Amount	$ 8,000,000	$ 187,000,000