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Investments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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

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