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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) - Nonrecurring - Level 3 - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |
Total assets at fair value | $ 150 | $ 150
Commercial borrower | Domestic loans |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |
Loans | 125 | 134
Commercial borrower | Non-US |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |
Loans | 4 |
Commercial borrower | Commercial mortgage | Domestic loans |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |
Loans | 17 | $ 16
Commercial borrower | Construction | Domestic loans |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |
Loans | $ 4 |

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