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Acquisitions (Schedule of recognized identifiable assets acquired and liabilities assumed) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Jul. 01, 2023 | Dec. 31, 2022 | Jul. 01, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accrued investment income |  | $ 1,086 |  | $ 941 |  |  |  |
Insurance and reinsurance balances receivable |  | 13,379 |  | 11,933 |  |  |  |
Reinsurance recoverable on losses and loss expenses | [1] | 19,952 |  | 18,859 |  |  |  |
Reinsurance recoverable on policy benefits | [1] | 280 |  | 302 |  |  |  |
Value of business acquired |  | 3,674 |  | 3,702 |  | $ 235 |  | $ 263
Other assets |  | 7,317 |  | 7,546 |  |  |  |
Total assets |  | 230,682 |  | 199,017 |  |  |  |
Unpaid losses and loss expenses |  | 80,122 |  | 75,747 |  | 72,330 |  | $ 67,192
Unearned premiums |  | 22,051 |  | 19,713 |  |  |  |
Future policy benefits |  | 13,888 |  | 10,476 |  | 7,837 | $ 7,652 |
Policyholders' account balances |  | 7,462 |  | 3,140 |  | 2,766 |  |
Insurance and reinsurance balances payable |  | 8,302 |  | 7,780 |  |  |  |
Accounts Payable and Accrued Liabilities |  | 8,332 |  | 7,148 |  |  |  |
Deferred tax liabilities |  | 1,555 |  | 377 |  |  |  |
Repurchase agreements |  | 2,833 |  | 1,419 |  |  |  |
Total liabilities |  | 166,991 |  | 148,498 |  |  |  |
Stockholders' Equity |  | 59,507 |  | 50,519 |  | 58,328 |  |
Noncontrolling interests |  | 4,184 |  | 0 |  |  |  |
Total shareholders’ equity |  | 63,691 |  | 50,519 |  | $ 58,328 |  |
Total liabilities and shareholders’ equity |  | $ 230,682 |  | $ 199,017 |  |  |  |
Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Investments and Cash |  |  |  |  | $ 5,281 |  |  |
Accrued investment income |  |  |  |  | 33 |  |  |
Insurance and reinsurance balances receivable |  |  |  |  | 52 |  |  |
Reinsurance recoverable on losses and loss expenses |  |  |  |  | 3 |  |  |
Reinsurance recoverable on policy benefits |  |  |  |  | 85 |  |  |
Value of business acquired |  |  |  |  | 3,633 |  |  |
Goodwill and intangible assets |  |  |  |  | 1,498 |  |  |
Other assets |  |  |  |  | 651 |  |  |
Total assets |  |  |  |  | 11,236 |  |  |
Unpaid losses and loss expenses |  |  |  |  | 12 |  |  |
Unearned premiums |  |  |  |  | 61 |  |  |
Future policy benefits |  |  |  |  | 3,856 |  |  |
Insurance and reinsurance balances payable |  |  |  |  | 115 |  |  |
Accounts Payable and Accrued Liabilities |  |  |  |  | 925 |  |  |
Deferred tax liabilities |  |  |  |  | 887 |  |  |
Repurchase agreements |  |  |  |  | 2,000 |  |  |
Total liabilities |  |  |  |  | 5,856 |  |  |
Stockholders' Equity |  |  |  |  | 5,380 |  |  |
Total liabilities and shareholders’ equity |  |  |  |  | $ 11,236 |  |  |
Huatai Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Investments and Cash |  |  | $ 13,346 |  |  |  |  |
Accrued investment income |  |  | 60 |  |  |  |  |
Insurance and reinsurance balances receivable |  |  | 277 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses |  |  | 581 |  |  |  |  |
Reinsurance recoverable on policy benefits |  |  | 27 |  |  |  |  |
Value of business acquired |  |  | 309 |  |  |  |  |
Goodwill and intangible assets |  |  | 5,049 |  |  |  |  |
Other assets |  |  | 748 |  |  |  |  |
Total assets |  |  | 20,397 |  |  |  |  |
Unpaid losses and loss expenses |  |  | 831 |  |  |  |  |
Unearned premiums |  |  | 800 |  |  |  |  |
Future policy benefits |  |  | 2,287 |  |  |  |  |
Policyholders' account balances |  |  | 4,014 |  |  |  |  |
Insurance and reinsurance balances payable |  |  | 644 |  |  |  |  |
Accounts Payable and Accrued Liabilities |  |  | 682 |  |  |  |  |
Deferred tax liabilities |  |  | 232 |  |  |  |  |
Repurchase agreements |  |  | 1,269 |  |  |  |  |
Total liabilities |  |  | 10,759 |  |  |  |  |
Stockholders' Equity |  |  | 4,428 |  |  |  |  |
Noncontrolling interests |  |  | 5,210 |  |  |  |  |
Total shareholders’ equity |  |  | $ 9,638 |  |  |  |  |
[1] | Net of valuation allowance for uncollectible reinsurance.

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