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Accumulated other comprehensive income - Reclassified Amounts (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Unrealized appreciation of investments, net [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications before income taxes $ (221) $ (305)
Applicable income taxes (46) (107)
Total reclassifications into net earnings (175) (198)
Prior service and actuarial gains/losses of defined benefit pension plans [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications before income taxes 10 24
Applicable income taxes 1 6
Total reclassifications into net earnings 9 18
Other AOCI transactions [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications before income taxes (5) 14
Applicable income taxes (2) 6
Total reclassifications into net earnings (3) 8
Accumulated other comprehensive income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications before income taxes (216) (267)
Applicable income taxes (47) (95)
Total reclassifications into net earnings $ (169) $ (172)