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Investments- Summary of Mortgage Loan and Other Loan Portfolio (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 237	$ 253
Financing Receivable, Credit Loss, Expense (Reversal)	(21)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	6
Financing Receivable, Allowance for Credit Loss, Writeoff	(1)
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	167	167
Financing Receivable, Credit Loss, Expense (Reversal)	0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	70	79
Financing Receivable, Credit Loss, Expense (Reversal)	(14)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	6
Financing Receivable, Allowance for Credit Loss, Writeoff	(1)
Other investments
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	0	$ 7
Financing Receivable, Credit Loss, Expense (Reversal)	(7)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 0

X

- Definition

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

+ References

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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