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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2023 | Jul. 01, 2023 | Jul. 01, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 19,554 |  | $ 16,228
Other intangible assets |  |  |  | 6,844 |  | 5,441
Value of business acquired |  |  |  | 3,675 |  | 3,702
Repurchase agreements (refer to Note 3 for balances associated with VIEs) |  |  |  | $ 2,617 |  | $ 1,419
Huatai Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  | 69.60% |  | 69.60% |  |
Additional 5.4 percent ownership interest obtained in subsidiary |  | 5.40% |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  | 30.40% |  |  |  |
Outstanding 14.1 percent additional ownership interest agreed on |  |  |  | 14.10% |  |
Outstanding 3.0 percent ownership interest agreed on requiring regulatory approval |  |  |  | 3.00% |  |
Huatai Group | Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional 2.5 percent ownership interest obtained in subsidiary | 2.50% |  |  |  |  |
Huatai Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 64.20% |
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 1,177 |  |  |
Other intangible assets |  |  | 309 |  |  |
Value of business acquired |  |  | $ 3,633 |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Jul. 01, 2022 |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 5,400 |  |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) |  |  | $ 2,000 |  |  |
Huatai Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  | $ 318 |  |  |  |
Deposits previously paid on additional ownership interest agreed on |  |  |  | $ 416 |  |
Outstanding payment to be made on additional ownership interest agreed on |  |  |  | $ 433 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value |  | 4,100 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  | 744 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss |  | 17 |  |  |  |
Write-off of Accumulated AOCI Loss Balance, Equity Method Invesmtent |  | 611 |  |  |  |
Business combination, Realized Gain (Loss) from Write-off of AOCI |  | (628) |  |  |  |
Goodwill |  | 3,394 |  |  |  |
Other intangible assets |  | 1,655 |  |  |  |
Value of business acquired |  | 309 |  |  |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) |  | $ 1,269 |  |  |  |
Huatai Group | Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deposits previously paid on additional ownership interest obtained | $ 146 |  |  |  |  |

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