Investments (Net Gains/Losses On Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment [Line Items]
Net (losses) gains on investments	$ (630)	$ 311	$ 184
Fixed Maturity Securities [Member]
Investment [Line Items]
Gross realized gains from sales	52	170	175
Gross realized losses from sales	(469)	(44)	(105)
Impairment (losses) recoveries recognized in income	(31)	1	(7)
Net realized gains on fixed maturity securities	(448)	127	63
Equity Securities [Member]
Investment [Line Items]
Unrealized gains (losses) recognized in income on equity securities	(78)	2	133
Net realized (losses) gains recognized on equity securities sold	(102)	(73)	61
Net (losses) gains on equity securities	(180)	(71)	194
Other Investments [Member]
Investment [Line Items]
Impairment (losses) recoveries recognized in income	(34)	(16)	(91)
Gross gains from other investments	96	293	18
Gross losses from other investments	(64)	(22)	0
Net (losses) gains on other investments	$ (2)	$ 255	$ (73)

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Gross Losses From Other Investments

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Total impairment (losses) reversals on investments, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Investment Gains (Losses)

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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