Investments - Commercial Mortgage Loans (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale	$ 1,509	$ 1,533
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	1.82	1.82
Average Loan-to-Value Ratio, including assets held for sale	0.65	0.64
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale	$ 685	$ 802
Below 60% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	2.15	2.13
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale	$ 619	$ 574
60% to 79% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	1.76	1.77
80% to 100%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale	$ 205	$ 157
80% to 100% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	1.02	0.65