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Segment Reporting - Reconciliation of Consolidated Operating Income to Adjusted Operating Income (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 01, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting [Abstract] |  |  |  |  |  |
Operating income (loss) (GAAP measure) |  | $ 3,690 |  | $ (3,919) | $ 10,370 | $ 4,295
Amortization of intangible assets |  | 509 |  | 458 | 1,396 | 1,380
Net realized capital losses |  | 142 |  | 110 | 345 | 283
Acquisition-related integration costs |  | 94 |  | 0 | 294 | 0
Restructuring charges |  | 11 | $ 496 | 0 | 507 | 0
Office real estate optimization charges |  | 10 |  | 0 | 46 | 0
Loss on assets held for sale |  | 0 |  | 2,480 | 349 | 2,521
Opioid litigation charges |  | 0 |  | 5,220 | 0 | 5,704
Gain on sale of subsidiary |  | 0 |  | 0 | 0 | (225)
Adjusted operating income |  | $ 4,456 |  | $ 4,349 | $ 13,307 | $ 13,958
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Payflex | Health Care Benefits |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |
Proceeds from divestiture of subsidiary | $ 775 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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