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Claim and Claim Adjustment Expense Reserves - Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total pretax (favorable) unfavorable development | $ (132) | $ (175) | $ (282) | $ (187)
CNA Financial [Member] | Specialty [Member] |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Medical professional liability | 13 | (19) | (17) | (11)
Other professional liability and management liability | (48) | (37) | (98) | (41)
Surety | (63) | (70) | (63) | (69)
Warranty | 2 |  | 7 | 1
Other | (16) | (4) | (40) | (21)
Total pretax (favorable) unfavorable development | (112) | (130) | (211) | (141)
CNA Financial [Member] | Commercial [Member] |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Commercial auto | (12) |  | (47) | 7
General liability | 14 | 3 | (38) | 8
Workers' compensation | (6) | (1) | 48 | 22
Property and other | (1) | (13) |  | (37)
Total pretax (favorable) unfavorable development | (5) | (11) | (37) |
CNA Financial [Member] | International [Member] |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Medical professional liability | (2) | (8) | (3) | (8)
Other professional liability | (1) | (11) | 16 | (16)
General liability | (2) | (5) | (21) | (12)
Property & marine | (9) | (5) | (16) | (19)
Other | (1) | (5) | (10) | 9
Total pretax (favorable) unfavorable development | $ (15) | $ (34) | $ (34) | $ (46)

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