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v3.24.0.1

Accumulated other comprehensive income (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | $ 473,424 |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2018-12 [Member] |  |  | Accounting Standards Update 2018-12 [Member]
Ending Balance | $ 436,736 | 561,273 | $ 473,424 |
Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 443,164 |  |  | $ 443,164
Unrealized gains (losses) on investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 536 | (187) | 369 | 536
Other comprehensive income |  | 377 | (556) | (167)
Ending Balance |  | 190 | (187) | 369
Unrealized gains (losses) on investments [Member] | Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 536 |  |  | 536
Foreign currency translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (3,082) | (6,142) | (4,092) | (3,082)
Other comprehensive income |  | 749 | (2,050) | (1,010)
Ending Balance |  | (5,393) | (6,142) | (4,092)
Foreign currency translation [Member] | Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (3,082) |  |  | (3,082)
Long duration insurance contracts [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (5,751) | 1,541 | (4,096) | (5,751)
Other comprehensive income |  | (188) | 5,637 | 1,655
Ending Balance |  | 1,353 | 1,541 | (4,096)
Long duration insurance contracts [Member] | Effect of adoption of ASU 2018-12 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (5,751) |  |  | (5,751)
Defined benefit pension plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1,645) | (552) | (347) | (1,645)
Other comprehensive income |  | 455 | (205) | 1,298
Ending Balance |  | (97) | (552) | (347)
Defined benefit pension plans [Member] | Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1,645) |  |  | (1,645)
Other AOCI transactions [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (52) | 288 | 43 | (52)
Other comprehensive income |  | (104) | 245 | 95
Ending Balance |  | 184 | 288 | 43
Other AOCI transactions [Member] | Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (52) |  |  | (52)
Accumulated other comprehensive income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (9,994) | (5,052) | (8,123) | (9,994)
Other comprehensive income |  | 1,289 | 3,071 | 1,871
Ending Balance |  | $ (3,763) | $ (5,052) | (8,123)
Accumulated other comprehensive income [Member] | Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (4,243) |  |  | (4,243)
Accumulated other comprehensive income [Member] | Effect of adoption of ASU 2018-12 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ (5,751) |  |  | $ (5,751)

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