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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | $ 10,153 | $ 11,697 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 35 | 44 | $ 0
Debt securities, held to maturity, net carrying value | 10,118 | 11,653 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 533 | 859 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4) | (2) |
Held to maturity, Fair Value | 10,647 | 12,510 |
U.S. Treasury and agency |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,213 | 1,392 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 |
Debt securities, held to maturity, net carrying value | 1,213 | 1,392 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 34 | 60 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3) | 0 |
Held to maturity, Fair Value | 1,244 | 1,452 |
Foreign |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,201 | 1,295 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 5 | 7 |
Debt securities, held to maturity, net carrying value | 1,196 | 1,288 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 66 | 118 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (1) |
Held to maturity, Fair Value | 1,262 | 1,405 |
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 2,032 | 2,185 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 28 | 35 |
Debt securities, held to maturity, net carrying value | 2,004 | 2,150 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 197 | 288 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0 |
Held to maturity, Fair Value | 2,201 | 2,438 |
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,731 | 2,000 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 1 | 1 |
Debt securities, held to maturity, net carrying value | 1,730 | 1,999 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 74 | 148 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1) | (1) |
Held to maturity, Fair Value | 1,803 | 2,146 |
States, municipalities, and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 3,976 | 4,825 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 1 | 1 |
Debt securities, held to maturity, net carrying value | 3,975 | 4,824 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 162 | 245 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0 |
Held to maturity, Fair Value | $ 4,137 | $ 5,069 |

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