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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing receivables - credit quality information
Less: allowance for loan losses	$ 50	$ 68	$ 51
Commercial Loans
Financing receivables - credit quality information
Less: allowance for loan losses	47	66	$ 51
Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Loans	1,916	2,725
Less: allowance for loan losses	12	29
Total loans	1,904	2,696
Commercial Loans \| Commercial mortgage loans \| Apartments
Financing receivables - credit quality information
Loans	496	713
Commercial Loans \| Commercial mortgage loans \| Hotel
Financing receivables - credit quality information
Loans	14	50
Commercial Loans \| Commercial mortgage loans \| Industrial
Financing receivables - credit quality information
Loans	319	427
Commercial Loans \| Commercial mortgage loans \| Mixed Use
Financing receivables - credit quality information
Loans	68	87
Commercial Loans \| Commercial mortgage loans \| Office
Financing receivables - credit quality information
Loans	271	372
Commercial Loans \| Commercial mortgage loans \| Retail
Financing receivables - credit quality information
Loans	617	881
Commercial Loans \| Commercial mortgage loans \| Other
Financing receivables - credit quality information
Loans	$ 131	$ 195
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Percentage of total	100.00%	100.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Apartments
Financing receivables - credit quality information
Percentage of total	26.00%	26.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Hotel
Financing receivables - credit quality information
Percentage of total	1.00%	2.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Industrial
Financing receivables - credit quality information
Percentage of total	17.00%	16.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Mixed Use
Financing receivables - credit quality information
Percentage of total	3.00%	3.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Office
Financing receivables - credit quality information
Percentage of total	14.00%	14.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Retail
Financing receivables - credit quality information
Percentage of total	32.00%	32.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Other
Financing receivables - credit quality information
Percentage of total	7.00%	7.00%