Schedule V Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021	Jan. 01, 2020	Jan. 01, 2019
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Movement in Valuation allowance and reserves
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 2
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings
Movement in Valuation allowance and reserves
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					$ (18)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]
Movement in Valuation allowance and reserves
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					2
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Premiums Receivable [Member]
Movement in Valuation allowance and reserves
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					23
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Commercial Loan [Member]
Movement in Valuation allowance and reserves
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					19
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable
Movement in Valuation allowance and reserves
Valuation allowances and reserves	$ 1	$ 23		$ 23
Increase (decrease) in Costs and Expenses	(4)	30
Write-offs/ Payments/ Other	(18)	(7)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	1	23		23
SEC Schedule, 12-09, Allowance, Loan and Lease Loss, Real Estate [Member]
Movement in Valuation allowance and reserves
Valuation allowances and reserves	29	38	0	38	19	$ 1
Increase (decrease) in Costs and Expenses	(9)	19	(1)
Write-offs/ Payments/ Other	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	29	38	0	38	19	1
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable
Movement in Valuation allowance and reserves
Valuation allowances and reserves	105	152	145	152	122	135
Increase (decrease) in Costs and Expenses	4	74	42
Write-offs/ Payments/ Other	(51)	(44)	(32)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	105	152	145	152	122	135
SEC Schedule, 12-09, Allowance, Reinsurance Recoverable [Member]
Movement in Valuation allowance and reserves
Valuation allowances and reserves	99	108	114	108	116	126
Increase (decrease) in Costs and Expenses	3	4	2
Write-offs/ Payments/ Other	(12)	(12)	(14)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	99	108	114	108	116	126
Valuation allowance for deferred taxes
Movement in Valuation allowance and reserves
Valuation allowances and reserves	7	4	4	4	4	0
Increase (decrease) in Costs and Expenses	9	9	0
Write-offs/ Payments/ Other	(6)	(9)	4
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 7	$ 4	$ 4	$ 4	$ 4	$ 0