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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 55,873 | $ 49,548
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 60,749 | 56,735
Assets Held-in-trust | 465 | 572
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Assets Held-in-trust | 31,173 | 31,179
Carrying Value [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Assets Held-in-trust | 28,671 | 27,675
Collateral Fixed Maturity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 100 | 148
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 103 | 162
Collateral Received Fixed Maturity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 1,922 | $ 1,784

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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