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Debt Securities (Composition of Debt Securities Portfolio in Unrealized Loss Position by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 7,832 | $ 5,772
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 124 | 76
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 1,271 | 684
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 169 | 136
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 129 | 73
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 4,781 | 4,036
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 917 | 533
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 441 | $ 234
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 6,986 |
Percentage of debt securities in unrealized loss position | 89.20% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 628 |
Percentage of debt securities in unrealized loss position | 8.00% |
Investment Grade | U.S. Treasury bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 124 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | U.S. Treasury bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Municipal bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 1,231 |
Percentage of debt securities in unrealized loss position | 96.90% |
Investment Grade | Municipal bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 40 |
Percentage of debt securities in unrealized loss position | 3.10% |
Investment Grade | Foreign government bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 161 |
Percentage of debt securities in unrealized loss position | 95.20% |
Investment Grade | Foreign government bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 5 |
Percentage of debt securities in unrealized loss position | 3.00% |
Investment Grade | Governmental agency bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 129 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Governmental agency mortgage-backed securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 4,781 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency mortgage-backed securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | U.S. corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 380 |
Percentage of debt securities in unrealized loss position | 41.40% |
Investment Grade | U.S. corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 359 |
Percentage of debt securities in unrealized loss position | 39.20% |
Investment Grade | Foreign corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 180 |
Percentage of debt securities in unrealized loss position | 40.80% |
Investment Grade | Foreign corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 224 |
Percentage of debt securities in unrealized loss position | 50.80% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 218 |
Percentage of debt securities in unrealized loss position | 2.80% |
Non-Investment Grade | U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 3 |
Percentage of debt securities in unrealized loss position | 1.80% |
Non-Investment Grade | Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 178 |
Percentage of debt securities in unrealized loss position | 19.40% |
Non-Investment Grade | Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 37 |
Percentage of debt securities in unrealized loss position | 8.40% |

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