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Fair value measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | $ 0 | $ 8,439
Private debt held-for-investment | 2,401 | 0
Total assets (preliminary) | 222,748 | 199,017
Debt Securities, Held-to-maturity |  | 8,882
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 2,617 | 1,419
Short-term debt | 700 | 475
Long-term debt | 13,736 | 14,402
Total liabilities | 165,244 | 148,498
Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,299
Private debt held-for-investment | 0 |
Total assets (preliminary) | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 0 | 0
Short-Term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 7,140
Private debt held-for-investment | 0 |
Total assets (preliminary) | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 2,617 | 1,419
Short-Term Debt, Fair Value | 688 | 473
Long-term Debt, Fair Value | 11,627 | 12,495
Trust preferred securities | 362 | 383
Total liabilities | 15,294 | 14,770
Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Private debt held-for-investment | 2,389 |
Total assets (preliminary) | 2,389 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 0 | 0
Short-Term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 8,439
Private debt held-for-investment | 2,389 |
Total assets (preliminary) | 2,389 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 2,617 | 1,419
Short-Term Debt, Fair Value | 688 | 473
Long-term Debt, Fair Value | 11,627 | 12,495
Trust preferred securities | 362 | 383
Total liabilities | 15,294 | 14,770
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 2,401 |
Total assets (preliminary) | 2,401 |
Debt Securities, Held-to-maturity |  | 8,848
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements (refer to Note 3 for balances associated with VIEs) | 2,617 | 1,419
Short-term debt | 700 | 475
Long-term debt | 13,736 | 14,402
Trust preferred securities | 308 | 308
Total liabilities | $ 17,361 | 16,604
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,370
Debt Securities, Held-to-maturity |  | 1,417
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,299
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 71
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,370
U.S. Treasury / Agency | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity |  | 1,417
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Debt Securities, Held-to-maturity |  | 1,140
Non-U.S. | Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Non-U.S. | Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Non-U.S. | Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Non-U.S. | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Non-U.S. | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity |  | 1,136
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Debt Securities, Held-to-maturity |  | 1,733
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Corporate and asset-backed securities | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity |  | 1,705
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Debt Securities, Held-to-maturity |  | 1,456
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Mortgage-backed securities | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity |  | 1,455
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 3,084
Debt Securities, Held-to-maturity |  | 3,136
Municipal | Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Municipal | Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 3,084
Municipal | Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Municipal | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 3,084
Municipal | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity |  | $ 3,135

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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