Investments - Net Gains (Losses) on Derivatives and Investments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Available-for-sale securities
Realized gains on sale	$ 24	$ 25
Realized losses on sale	(178)	(6)
Credit loss income (expense)	0	9
Credit loss income (expense) on mortgage loans	12	59
Other	12	66
Net gains (losses) excluding derivatives and funds withheld assets	(130)	153
Net gains (losses) on derivative instruments	2,009	2,670
Total net gains (losses) on derivatives and investments	1,605	2,706
Derivatives excluding funds withheld under reinsurance treaties
Available-for-sale securities
Net gains (losses) on derivative instruments	707	1,655
Derivatives related to funds withheld under reinsurance treaties
Available-for-sale securities
Net gains (losses) on derivative instruments	1,302	1,015
Net gains (losses) on funds withheld reinsurance treaties	$ 1,028	$ 898

Debt Securities, Available For Sale, Credit Loss Expense (Reversal)

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Financing Receivable, Credit Loss, Expense (Reversal) And Other (Gain) Loss

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Gain (Loss) On Investments And Derivative Instruments

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Other Operating Gain (Loss)

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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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-Publisher FASB
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Amount of realized 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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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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

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The aggregate amount of gains or losses resulting from nonoperating activities (for example, interest and dividend revenue, property, plant and equipment impairment loss, and so forth).

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