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Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	$ (87)	$ (28)
Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	40,083	42,187
Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	21,361	22,708
States, Municipalities and Political Subdivisions [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	10,491	10,652
Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	8,231	8,827
Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	41	53
Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	40,124	42,240
Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	1,182	1,306
Short-term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	3,627	4,521
Receivables [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets		2
Level 1 [Member] | Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	(55)	(18)
Level 1 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	175	175
Level 1 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	175	175
Level 1 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	175	175
Level 1 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	628	629
Level 1 [Member] | Short-term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	3,224	3,138
Level 2 [Member] | Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	(32)	(10)
Level 2 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	39,215	41,379
Level 2 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	20,690	22,065
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	10,491	10,652
Level 2 [Member] | Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	8,034	8,662
Level 2 [Member] | Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	38	49
Level 2 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	39,253	41,428
Level 2 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	538	658
Level 2 [Member] | Short-term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	403	1,383
Level 2 [Member] | Receivables [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets		2
Level 3 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	693	633
Level 3 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	496	468
Level 3 [Member] | Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	197	165
Level 3 [Member] | Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	3	4
Level 3 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	696	637
Level 3 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	$ 16	$ 19

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value of financial and nonfinancial obligations.

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