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Commitments and Contingent Liabilities (Assurance IQ Contingent Consideration Liability Narrative) (Details) - USD ($) | 3 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2020 | Oct. 31, 2019 | Sep. 04, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) | $ 2,804,000,000 | $ (270,000,000) |  |  |  |
Share price (usd per share) |  |  |  |  |  | $ 83.71
Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration, liability | $ 0 |  |  | $ 0 |  |
Cash | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity interest in acquiree |  |  |  |  | 25.00% |
Common Stock | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity interest in acquiree |  |  |  |  | 75.00% |
Condition Three | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent liability, stock based compensation component |  |  |  | $ 900,000,000 |  |
Condition Four - Quotient - Denominator | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration payable, cash and equity interests |  |  |  |  | $ 400,000,000 |
Condition Four - Multiplier | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration payable, cash and equity interests |  |  |  |  | 1,150,000,000 |
Subsequent Event | Condition One | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | $ 900,000,000 |  |  |
Subsequent Event | Condition Four - Quotient - Numerator | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | 900,000,000 |  |  |
Minimum | Condition One | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration payable, cash and equity interests |  |  |  |  | 0 |
Minimum | Subsequent Event | Condition Two | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | 1,300,000,000 |  |  |
Minimum | Subsequent Event | Condition Three | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | 900,000,000 |  |  |
Maximum | Condition Two | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration payable, cash and equity interests |  |  |  |  | $ 1,150,000,000 |
Maximum | Subsequent Event | Condition Three | Acquisition of Assurance IQ, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | $ 1,300,000,000 |  |  |

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