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Impact of New Accounting Standard (DAC) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | $ 4,617 | $ 4,128 |  |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 4,128 | $ 3,860 |  |
Deferred Policy Acquisition Costs, Amortization Expense | $ (1,344) | $ (1,325) |  |  |  |  |
Life Insurance Product Line [Member] | Americas [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 2,087 | 1,947 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 248 | 284 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (145) | (144) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 1 | 0 |  |  |
Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 1,947 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 254 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (123) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | 0 |  |
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 171 | 191 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 9 | 10 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (12) | (17) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 5 | (13) |  |  |
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 191 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 8 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (13) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | 1 |  |
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 294 | 270 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 100 | 83 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (50) | (38) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 3 | (21) |  |  |
Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 270 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 42 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (24) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | (12) |  |
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 1,043 | 1,056 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 121 | 86 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (59) | (67) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | (7) | (32) |  |  |
Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 1,056 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 83 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (55) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | (18) |  |
Insurance, Other [Member] | Americas [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 341 | 312 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 259 | 87 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (48) | (58) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 0 | 0 |  |  |
Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 312 | $ 368 |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 8 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (64) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | 0 |  |
Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 0 | 0 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 0 | 0 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | 0 | 0 |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 0 | 0 |  |  |
Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 0 | 0 |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 0 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | 0 |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | 0 |  |
Insurance, Other [Member] | EMEA [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 0 | 0 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 0 | 0 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | 0 | 0 |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | 0 | 0 |  |  |
Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 0 | 0 |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 0 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | 0 |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | 0 |  |
Insurance, Other [Member] | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  | 188 | 81 |  |
Deferred Policy Acquisition Cost, Capitalization |  |  | 99 | 121 |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | (33) | (13) |  |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  | $ (4) | $ (1) |  |  |
Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 81 | $ 41 |
Deferred Policy Acquisition Cost, Capitalization |  |  |  |  | 49 |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | (8) |  |
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment |  |  |  |  | $ (1) |  |
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | $ 1,816
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 195
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 264
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 1,046
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 254
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 41
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 114
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 1,816
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 195
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 264
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 1,046
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 368
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | $ 41

X
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