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Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2024 $ / shares | Mar. 15, 2024 USD ($) $ / shares shares | Mar. 14, 2019 USD ($) $ / shares shares | Jul. 26, 2024 USD ($) shares | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Apr. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 5.00 |  | $ 5.00 |  |  | $ 5.00
Proceeds from redemption of preferred stock |  |  |  |  |  |  | $ 485 | $ 0 |  |
Redemption premium realized |  | $ 15 |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 2.50 |  | $ 2.50 |  |  | $ 2.50
Statutory capital and surplus restricted |  |  |  |  | $ 28,700 |  | $ 28,700 |  |  | $ 28,500
Authorized repurchase amount |  |  |  |  |  |  |  |  | $ 10,000 |
Remaining authorized repurchase amount |  |  |  |  |  |  |  |  | $ 3,900 |
Shares purchased (in shares) | shares |  |  |  |  |  |  | 45,100,000 |  |  |
Aggregate repurchases of common stock |  |  |  |  | $ 1,677 | $ 562 | $ 3,359 | $ 1,165 |  |
New York |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Surplus not available for dividends (as a percent) |  |  |  |  | 10.00% |  | 10.00% |  |  |
Adjusted net investment income not available for dividends (as a percent) |  |  |  |  | 100.00% |  | 100.00% |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares purchased (in shares) | shares |  |  |  | 6,000,000 |  |  |  |  |  |
Aggregate repurchases of common stock |  |  |  | $ 459 |  |  |  |  |  |
Dividends declared, common stock (in dollars per share) | $ / shares | $ 0.40 |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuances (in shares) | shares |  |  | 20,000 |  |  |  |  |  |  |
Preferred stock, dividend rate (as a percent) |  |  | 5.85% |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 5.00 |  |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) | $ / shares |  |  | $ 25,000 |  |  |  |  |  |  |
Issuance of preferred stock |  |  | $ 485 |  |  |  |  |  |  |
Stock redeemed during the period (in shares) | shares |  | 20,000 |  |  |  |  |  |  |  |
Preferred stock redemption price per share (in USD per share) | $ / shares |  | $ 25,000 |  |  |  |  |  |  |  |
Proceeds from redemption of preferred stock |  | $ 500 |  |  |  |  |  |  |  |
Series A Depositary Shares |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuances (in shares) | shares |  |  | 20,000,000 |  |  |  |  |  |  |
Depository shares, equity interest in preferred stock (as a percent) |  |  | 0.001 |  |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) | $ / shares |  |  | $ 25 |  |  |  |  |  |  |
Stock redeemed during the period (in shares) | shares |  | 20,000,000 |  |  |  |  |  |  |  |
Preferred stock redemption, depository shares equity interest in preferred stock (as a percent) |  | 0.001 |  |  |  |  |  |  |  |
Preferred stock redemption price per share (in USD per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  |  |

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