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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2021	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, before Allowance for Credit Loss						$ 4,215
Mortgage loans (net of ACL of $36 and $29)						0
Financing Receivable, after Allowance for Credit Loss	$ 6,000	$ 5,383				4,215
Premiums Receivable, Gross	5,058	4,550				4,529
Premium Receivable, Allowance for Credit Loss	(109)	(105)	$ (152)			(145)
Premiums Receivable, Net	4,949	4,445				4,384
Reinsurance Recoverables, Gross	7,071	6,622				5,641
Allowance for uncollectible reinsurance	(105)	(99)	(108)			(114)
Reinsurance recoverables, net	6,966	6,523				5,527
Deferred income taxes	1,449	270				299
Other Liabilities	(4,757)	(5,655)				(5,157)
Retained Earnings (Accumulated Deficit)	17,048	15,764				12,685
Reserve for future policy benefits	561	596	638
Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization	78	60	42
Commercial Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,036	5,412
Mortgage loans (net of ACL of $36 and $29)	(36)	(29)	(38)			0
Financing Receivable, after Allowance for Credit Loss	6,000	5,383
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance Recoverables, Gross	300
Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance	(45)	(45)	(55)			(48)
Reinsurance Policy, Type [Axis]: Disputes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance	(60)	(54)	(53)			(114)
Reinsurance Policy, Type [Axis]: Disputes [Members]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance		$ (54)	$ (53)			(66)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						(2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)					$ 19
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits				$ 85
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, before Allowance for Credit Loss					4,215
Mortgage loans (net of ACL of $36 and $29)					(19)
Financing Receivable, after Allowance for Credit Loss					4,196
Premiums Receivable, Gross					4,529
Premium Receivable, Allowance for Credit Loss					(122)	(122)
Premiums Receivable, Net					4,407
Reinsurance Recoverables, Gross					5,641
Reinsurance recoverables, net					5,525
Deferred income taxes					304
Other Liabilities					(5,182)
Retained Earnings (Accumulated Deficit)					12,667
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Mortgage loans (net of ACL of $36 and $29)					(19)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance						$ (50)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Reinsurance Policy, Type [Axis]: Disputes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance					(116)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					18
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					(2)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Deferred Income Tax Asset, Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					(5)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Other liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					(25)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Total Change to LCL and ACL [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					23
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					(23)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					$ (19)
Accumulated Other Comprehensive Income (Loss), net of tax | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (35)			$ 65

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