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Acquisitions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jul. 01, 2022 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 16,287 | $ 16,287 | $ 15,213 | $ 15,400 |
Other intangible assets |  |  |  |  | 5,441 | 5,441 | 5,455 |  |
Value of business acquired |  |  |  |  | 3,596 | 3,596 | 236 | 263 | $ 306
Repurchase agreements |  |  |  |  | 1,419 | 1,419 | 1,406 |  |
Accrued investment income |  |  |  |  | 941 | 941 | 821 |  |
Insurance and reinsurance balances receivable |  |  |  |  | 11,933 | 11,933 | 11,322 |  |
Reinsurance recoverable on losses and loss expenses | [1] |  |  |  | 18,901 | 18,901 | 17,366 |  |
Reinsurance recoverable on policy benefits | [1] |  |  |  | 303 | 303 | 213 |  |
Other assets |  |  |  |  | 12,736 | 12,736 | 11,792 |  |
Total assets |  |  |  |  | 199,144 | 199,144 | 200,054 |  |
Unpaid losses and loss expenses |  |  |  |  | 76,323 | 76,323 | 72,943 | 67,811 | $ 62,690
Unearned premiums |  |  |  |  | 20,360 | 20,360 | 19,101 |  |
Future policy benefits |  |  |  |  | 10,120 | 10,120 | 5,947 |  |
Insurance and reinsurance balances payable |  |  |  |  | 7,795 | 7,795 | 7,243 |  |
Accounts payable, accrued expenses, and other liabilities |  |  |  |  | 15,587 | 15,587 | 15,004 |  |
Deferred tax liabilities |  |  |  |  | 292 | 292 | 389 |  |
Total liabilities |  |  |  |  | 148,604 | 148,604 | 140,340 |  |
Stockholders' Equity |  |  |  |  | 50,540 | 50,540 | 59,714 | 59,441 |
Liabilities and Equity |  |  |  |  | 199,144 | 199,144 | 200,054 |  |
Business Combination, Integration Related Costs |  |  |  |  |  | 48 | 0 | 0 |
Revenues |  |  |  |  |  | 43,166 | 40,963 | 35,994 |
Net income |  |  |  |  |  | 5,313 | 8,539 | 3,533 |
Net premiums earned |  |  |  |  |  | 40,389 | 36,355 | $ 33,117 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  |  | 2,459 | 2,459 | 2,508 |  |
Indefinite-lived intangible assets, |  |  |  |  | 2,982 | 2,982 | 2,947 |  |
Total identified intangible assets |  |  |  |  | 5,441 | $ 5,441 | 5,455 |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, additional 31.8 percent agreed on |  |  |  |  |  | 31.80% |  |  |
Purchase of incremental ownership interest |  |  |  |  |  | $ 2,000 |  |  |
Deposits Assets |  |  |  |  | 184 | $ 184 | 1,100 |  |
Payment to acquire additional ownership interest in equity method investment |  |  |  | $ 500 |  |  |  |  |
Equity method investment, additional 7.1 percent agreed on |  |  |  | 7.05% |  |  |  |  |
Equity Method Investment, 83.2 percent agreed on |  |  |  |  |  | 83.20% |  |  |
Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, additional 22.0 percent agreed on |  | 22.00% |  |  |  |  |  |  |
Equity method investment, outstanding 3.0 percent requiring regulatory approval |  | 3.00% |  |  |  |  |  |  |
Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Jul. 01, 2022 |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 5,400 |  |  |  |  |  |
Goodwill |  |  | 1,250 |  |  |  |  |  |
Other intangible assets |  |  | 309 |  |  |  |  |  |
Value of business acquired |  |  | 3,503 |  |  |  |  |  |
Repurchase agreements |  |  | 2,000 |  |  |  |  |  |
Investments and Cash |  |  | 5,275 |  |  |  |  |  |
Accrued investment income |  |  | 33 |  |  |  |  |  |
Insurance and reinsurance balances receivable |  |  | 52 |  |  |  |  |  |
Reinsurance recoverable on losses and loss expenses |  |  | 3 |  |  |  |  |  |
Reinsurance recoverable on policy benefits |  |  | 82 |  |  |  |  |  |
Goodwill |  |  | 1,559 |  |  |  |  |  |
Other assets |  |  | 649 |  |  |  |  |  |
Total assets |  |  | 11,156 |  |  |  |  |  |
Unpaid losses and loss expenses |  |  | 12 |  |  |  |  |  |
Unearned premiums |  |  | 59 |  |  |  |  |  |
Future policy benefits |  |  | 3,817 |  |  |  |  |  |
Insurance and reinsurance balances payable |  |  | 115 |  |  |  |  |  |
Accounts payable, accrued expenses, and other liabilities |  |  | 924 |  |  |  |  |  |
Deferred tax liabilities |  |  | 870 |  |  |  |  |  |
Total liabilities |  |  | 5,797 |  |  |  |  |  |
Stockholders' Equity |  |  | 5,359 |  |  |  |  |  |
Liabilities and Equity |  |  | 11,156 |  |  |  |  |  |
Revenues |  |  |  |  | 1,507 |  |  |  |
Net income |  |  |  |  | $ 148 |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Total identified intangible assets |  |  | 309 |  |  |  |  |  |
Cigna's Life Insurance Business in Asian Markets | Pro Forma |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  | $ 41,913 | 39,495 |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  | 44,673 | 44,166 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  | $ 5,503 | $ 8,921 |  |
Direct Ownership [Member] | Huatai Group [Member] |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 47.30% | 47.30% |  |  |
Equity method investment, ownership percentage upon completion |  |  |  |  | 86.10% | 86.10% |  |  |
Direct Ownership [Member] | Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 64.20% |  |  |  |  |  |  |
Trademarks | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, |  |  | 70 |  |  |  |  |  |
Agency distribution relationships and renewal rights | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | $ 230 |  |  |  |  |  |
Finite-lived intangible assets, weighted average useful life |  |  | 22 years |  |  |  |  |  |
Unearned premium reserves intangible asset | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | $ 9 |  |  |  |  |  |
Finite-lived intangible assets, weighted average useful life |  |  | 1 year |  |  |  |  |  |
[1] | Net of valuation allowance for uncollectible reinsurance.

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