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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing receivables - credit quality information
Less: allowance for loan losses	$ 48	$ 50	$ 68	$ 68
Commercial Loans
Financing receivables - credit quality information
Less: allowance for loan losses	45	47	$ 65	$ 66
Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Loans	1,934	1,916
Less: allowance for loan losses	12	12
Total loans	1,922	1,904
Commercial Loans \| Commercial mortgage loans \| East North Central
Financing receivables - credit quality information
Loans	205	194
Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Loans	56	57
Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Loans	121	122
Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Loans	118	119
Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Loans	27	28
Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Loans	637	627
Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Loans	503	497
Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Loans	139	141
Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Loans	$ 128	$ 131
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 \| East North Central
Financing receivables - credit quality information
Percentage of total	11.00%	10.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Percentage of total	3.00%	3.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Percentage of total	1.00%	2.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Percentage of total	33.00%	33.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Percentage of total	26.00%	26.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Percentage of total	7.00%	7.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Percentage of total	7.00%	7.00%