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Commitments, contingencies, and guarantees (Narrative) (Detail) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 EUR (€)
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Derivative Liability, Fair Value, Amount Subject to a Master Netting Agreement | $ 115 | $ 60 |  |
Securities Sold under Agreements to Repurchase | 2,833 | 1,419 |  |
Repurchase agreements (includes VIE balances of $1,009 and nil) | $ 2,833 | $ 1,419 |  |
Concentration Risk Percentage Marsh | 11.00% | 11.00% | 12.00% | 11.00%
Purchase Commitment, Remaining Minimum Amount Committed | $ 1,000 | $ 770 |  |
Carrying value of limited partnerships and partially-owned investment companies included in other investments | 13,900 | 12,000 |  |
Funding commitments relating to limited partnerships and partially-owned investment companies | 6,200 | 7,400 |  |
Line of Credit Facility, Current Borrowing Capacity | 4,000 |  |  |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases | 3,000 |  |  |
Operating Lease, Right-of-Use Asset | 784 | 607 |  |
Operating Lease, Liability | $ 832 | $ 633 |  |
Operating Lease, Weighted Average Remaining Lease Term | 11 years 9 months 18 days |  |  | 11 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent | 4.60% |  |  | 4.60%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities |  | Other liabilities
Operating Lease, Cost | $ 181 | $ 161 | $ 149 |
Lessee, Lease Not Yet Commenced, Noncurrent Amount | 621 |  |  |
Interest expense | 672 | 570 | 492 |
Other Comprehensive Income (Loss), before Tax | 3,678 | (10,076) | $ (2,507) |
Long-Term Debt [Member] |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Hedged Liability, Fair Value Hedge | $ 1,600 |  |  | € 1,500
Revenue Benchmark |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Concentration Risk, Customer | accounted for more than 10 percent |  |  |
Letter of Credit [Member] |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 948 | 1,400 |  |
Fair Value Hedging |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Tax | 67 | (83) |  |
Net Investment Hedging |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Tax | (71) | (57) |  |
Fair Value Hedging |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Interest expense | $ (16) | $ (5) |  |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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