Investments - Allowance for Losses for Commercial Mortgage Loans (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Credit losses on mortgage loans for which credit losses were not previously recorded	$ 6
Initial allowance for credit losses recognized on financial assets accounted for as PCD	0
Increase (decrease) on mortgage loans with allowance recorded in previous period	0
Write-offs	0
Recoveries of amounts previously written off	0
Balance at September 30, 2020	6
Commercial Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance as of January 1, 2020	12
Credit losses on mortgage loans for which credit losses were not previously recorded	1
Initial allowance for credit losses recognized on financial assets accounted for as PCD	0
Increase (decrease) on mortgage loans with allowance recorded in previous period	28
Provision for expected credit losses	41
Write-offs	(2)
Recoveries of amounts previously written off	0
Balance at September 30, 2020	$ 39
COVID-19 Pandemic [Member] \| Commercial Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Mortgage Loans On Real Estate, Payment Forbearance Provided, Percent of Outstanding Principal Amount Of Loans	700.00%

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Amount of expense (reversal of expense) for expected credit loss on financing receivable, from change in present value of expected cash flows.

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Mortgage Loans On Real Estate, Payment Forbearance Provided, Percent of Outstanding Principal Amount Of Loans

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