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Investments, Investment Gains (Losses) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Investment Gains (Losses) [Abstract]
Investment gains	[1]	$ (216)	$ 31
Gross investment gains on available-for-sale securities		29	36
Gross investment losses on available-for-sale securities		104	42
Fixed Maturity Securities [Member]
Investment Gains (Losses) [Abstract]
Investment gains		(75)	(6)
Equity Securities [Member]
Investment Gains (Losses) [Abstract]
Investment gains		(133)	42
Derivative Instruments [Member]
Investment Gains (Losses) [Abstract]
Investment gains		5	(5)
Short-term Investments and Other [Member]
Investment Gains (Losses) [Abstract]
Investment gains		(13)
Nonredeemable Preferred Stock [Member]
Investment Gains (Losses) [Abstract]
Net recognized gains (losses) on securities		$ (133)	$ 42
[1] Gross investment gains on available-for-sale securities were $29 and $36 for the three months ended March 31, 2020 and 2019. Gross investment losses on available-for-sale securities were $104 and $42 for the three months ended March 31, 2020 and 2019. During the three months ended March 31, 2020 and 2019, $133 of net investment losses and $42 of net investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2020 and 2019.

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Amount of realized and unrealized gain (loss) on investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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