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Unpaid losses and loss expenses Unpaid losses and loss expenses (Reconciliation of reserve Balances to Liability for Unpaid Loss)(Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net $ 46,700      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 14,187      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Aggregate Reconciling Items [1] 810      
Unpaid unallocated loss adjustment expenses 1,482      
Unpaid losses and loss expenses 63,179 $ 60,540 $ 37,303 $ 38,315
North America Commercial P&C Insurance - Workers' Compensation [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 8,873      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 1,737      
North America Commercial P&C Insurance - Liability [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 16,631      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 4,133      
North America Commercial P&C Insurance - Other Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 1,789      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 813      
North America Commercial P&C Insurance - Non-Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 2,398      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 1,336      
North America Personal P&C Insurance [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 2,421      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 503      
Overseas General Insurance - Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 6,026      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 2,550      
Overseas General Insurance - Non-Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 2,549      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 1,269      
Global Reinsurance - Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 1,340      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 76      
Global Reinsurance - Non-Casualty [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 371      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 142      
Other Short-duration Insurance Product Line [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid Loss and Allocated Loss Adjustment Expenses, Net 4,302      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 1,628      
[1] (1) Primarily includes the claims reserve of our international A&H business and Life Insurance segment reserves.