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Investments (Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | $ 9,566 |  | $ 10,153 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (34) | $ (34) | (35) | $ (37) | $ (43) | $ (44)
Debt securities, held to maturity, net carrying value | 9,532 |  | 10,118 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 18 |  | 533 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (217) |  | (4) |  |  |
Held to maturity, at Fair Value | 9,333 |  | 10,647 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,298 |  | 1,213 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt securities, held to maturity, net carrying value | 1,298 |  | 1,213 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 4 |  | 34 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (29) |  | (3) |  |  |
Held to maturity, at Fair Value | 1,273 |  | 1,244 |  |  |
Non-U.S. |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,112 |  | 1,201 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (4) |  | (5) |  |  |
Debt securities, held to maturity, net carrying value | 1,108 |  | 1,196 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2 |  | 66 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (39) |  | 0 |  |  |
Held to maturity, at Fair Value | 1,071 |  | 1,262 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,844 |  | 2,032 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (28) |  | (28) |  |  |
Debt securities, held to maturity, net carrying value | 1,816 |  | 2,004 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3 |  | 197 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (73) |  | 0 |  |  |
Held to maturity, at Fair Value | 1,746 |  | 2,201 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,651 |  | 1,731 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |  | (1) |  |  |
Debt securities, held to maturity, net carrying value | 1,650 |  | 1,730 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 |  | 74 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (53) |  | (1) |  |  |
Held to maturity, at Fair Value | 1,598 |  | 1,803 |  |  |
Municipal |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 3,661 |  | 3,976 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |  | (1) |  |  |
Debt securities, held to maturity, net carrying value | 3,660 |  | 3,975 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 8 |  | 162 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (23) |  | 0 |  |  |
Held to maturity, at Fair Value | $ 3,645 |  | $ 4,137 |  |  |

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