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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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 $38 and $—)			0
Financing Receivable, after Allowance for Credit Loss			4,215
Premiums Receivable, Gross	$ 4,420		4,529
Premium Receivable, Allowance for Credit Loss	(152)		(145)
Premiums Receivable, Net	4,268		4,384
Reinsurance Recoverables, Gross	6,119		5,641
Allowance for uncollectible reinsurance	(55)		(48)
Reinsurance recoverables, net	6,011		5,527
Deferred income taxes	46		299
Other Liabilities	(5,222)		(5,157)
Retained Earnings (Accumulated Deficit)	13,918		12,685
Commercial Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,531		4,215
Mortgage loans (net of ACL of $38 and $—)	(38)		0	$ (1)	$ (1)
Uncollectible reinsurance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for uncollectible reinsurance	(108)		(114)
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, 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 $38 and $—)		(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
Allowance for uncollectible reinsurance			$ (50)
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 $38 and $—)		(19)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Uncollectible reinsurance
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)

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