Investments - Past due commercial mortgage loans (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current
Financing Receivable, Past Due [Line Items]
Past due commercial mortgage loans	$ 4,148	$ 4,227
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due commercial mortgage loans	0	0
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due commercial mortgage loans	0	0
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due commercial mortgage loans	0	0
Total Segment
Financing Receivable, Past Due [Line Items]
Past due commercial mortgage loans	$ 4,148	$ 4,227