Investments (excluding Consolidated Investment Entities) - Past due commercial mortgage loans (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 5,218	$ 5,445
Number of commercial mortgage loans in non-accrual status \| loan	1	0
LTV Ratio, nonaccrual	100.00%
Financing receivable, nonaccrual, interest income	$ 0
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 5,218	$ 5,445
Threshold period past due, nonaccrual	90 days
Commercial Portfolio Segment \| Current
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 5,202	5,445
Commercial Portfolio Segment \| 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Commercial Portfolio Segment \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Commercial Portfolio Segment \| Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 16	$ 0

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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