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Reserve for Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Loss Development to Liability for Unpaid Losses and Loss Adjustment Expenses, P&C (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Unpaid losses and loss adjustment expenses $ 33,029 $ 32,287  
Workers’ compensation      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 18,685    
Cumulative Paid for Accident Years Displayed in Triangles (10,965)    
Unpaid for Accident Years not Displayed in Triangles 2,316    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 341    
Discount (372)    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 10,005    
Reinsurance and Other Recoverables 2,160    
Unpaid losses and loss adjustment expenses 12,165    
General liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 3,605    
Cumulative Paid for Accident Years Displayed in Triangles (1,840)    
Unpaid for Accident Years not Displayed in Triangles 417    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 94    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 2,276    
Reinsurance and Other Recoverables 234    
Unpaid losses and loss adjustment expenses 2,510    
Package business      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 6,600    
Cumulative Paid for Accident Years Displayed in Triangles (5,128)    
Unpaid for Accident Years not Displayed in Triangles 43    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 94    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 1,609    
Reinsurance and Other Recoverables 44    
Unpaid losses and loss adjustment expenses 1,653    
Property | Property and Casualty, Commercial Insurance Product Line [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 3,124    
Cumulative Paid for Accident Years Displayed in Triangles (2,763)    
Unpaid for Accident Years not Displayed in Triangles 14    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 9    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 384    
Reinsurance and Other Recoverables 41    
Unpaid losses and loss adjustment expenses 425    
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 3,442    
Cumulative Paid for Accident Years Displayed in Triangles (2,604)    
Unpaid for Accident Years not Displayed in Triangles 17    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 23    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 878    
Reinsurance and Other Recoverables 43    
Unpaid losses and loss adjustment expenses 921    
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 12,262    
Cumulative Paid for Accident Years Displayed in Triangles (10,703)    
Unpaid for Accident Years not Displayed in Triangles 21    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 72    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 1,652    
Reinsurance and Other Recoverables 25    
Unpaid losses and loss adjustment expenses 1,677    
Commercial automobile physical damage      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 221    
Cumulative Paid for Accident Years Displayed in Triangles (210)    
Unpaid for Accident Years not Displayed in Triangles 2    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 13    
Reinsurance and Other Recoverables 0    
Unpaid losses and loss adjustment expenses 13    
Professional liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 1,491    
Cumulative Paid for Accident Years Displayed in Triangles (973)    
Unpaid for Accident Years not Displayed in Triangles 41    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 19    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 578    
Reinsurance and Other Recoverables 306    
Unpaid losses and loss adjustment expenses 884    
Bond      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 598    
Cumulative Paid for Accident Years Displayed in Triangles (356)    
Unpaid for Accident Years not Displayed in Triangles 28    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 20    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 290    
Reinsurance and Other Recoverables 12    
Unpaid losses and loss adjustment expenses 302    
Personal automobile physical damage      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 1,752    
Cumulative Paid for Accident Years Displayed in Triangles (1,716)    
Unpaid for Accident Years not Displayed in Triangles 1    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 3    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 40    
Reinsurance and Other Recoverables 0    
Unpaid losses and loss adjustment expenses 40    
Homeowners      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 7,714    
Cumulative Paid for Accident Years Displayed in Triangles (7,110)    
Unpaid for Accident Years not Displayed in Triangles 2    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 36    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 642    
Reinsurance and Other Recoverables 83    
Unpaid losses and loss adjustment expenses 725    
Other ongoing business      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Unpaid for Accident Years not Displayed in Triangles 197    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance (1)    
Discount (16)    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 180    
Reinsurance and Other Recoverables 297    
Unpaid losses and loss adjustment expenses 477    
Asbestos and Environmental      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Unpaid for Accident Years not Displayed in Triangles 1,254    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 1,254    
Reinsurance and Other Recoverables 1,032    
Unpaid losses and loss adjustment expenses 2,286    
Other operations      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Unpaid for Accident Years not Displayed in Triangles 413    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 138    
Discount 0    
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 551    
Reinsurance and Other Recoverables (45)    
Unpaid losses and loss adjustment expenses 506    
Property and Casualty Insurance Products      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Cumulative Incurred for Accident Years Displayed in Triangles 59,494    
Cumulative Paid for Accident Years Displayed in Triangles (44,368)    
Unpaid for Accident Years not Displayed in Triangles 4,766    
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 848    
Discount (388) $ (410) $ (483)
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 20,352    
Reinsurance and Other Recoverables 4,232    
Unpaid losses and loss adjustment expenses $ 24,584    
Property and Casualty Insurance Products | Maximum      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Period for long-tail lines included in loss triangles 10 years    
Period for short-tail lines included in loss triangles 3 years