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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Amount at par value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

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Amount at par value of financing receivable purchased with credit deterioration.

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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

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Amount of unrealized gain (loss) on investment.

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Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Investments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Write-down on accrued investment income receivable	$ 0	$ 0
Fixed maturity securities purchased with credit deterioration	0		$ 0
Loans on non-accrual status, do not have allowance for credit losses	15		15
Commercial mortgage and other loans purchased with credit deterioration	0		0
Loans on non-accrual status recognized in interest income	1	1
Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized Losses	2,331		949
Gross unrealized losses of twelve months or more concentrated in various sectors	543		463
Corporate securities
Schedule of Investments [Line Items]
Gross unrealized losses of twelve months or more concentrated in various sectors	543		463
Other income \| Equity securities
Schedule of Investments [Line Items]
Unrealized gains (losses) on investments	352	(1,481)
Other income \| Assets supporting experience-rated contractholder liabilities
Schedule of Investments [Line Items]
Unrealized gains (losses) on investments	$ (459)	$ (842)
California
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	28.00%
Texas
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	8.00%
New York
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	7.00%
Europe
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	8.00%
Australia
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	2.00%
Asia
Schedule of Investments [Line Items]
Commercial mortgage loan, concentration percentage	1.00%
NAIC High or Highest Quality Rating \| Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized Losses	$ 1,997		636
NAIC Other Than High or Highest Quality Rating \| Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized Losses	$ 334		$ 313