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Accumulated other comprehensive income (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 348,703  
Other comprehensive income, net before reclassifications (489) $ (970)
Reclassifications before income taxes 127 (188)
Applicable income taxes (31) 35
Ending Balance 397,609  
Unrealized appreciation of investments, net [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 370 62,093
Reclassifications to retained earnings upon adoption of new accounting standards   (61,340)
Other comprehensive income, net before reclassifications 95 (142)
Reclassifications before income taxes 53 (299)
Applicable income taxes (11) 63
Ending Balance 507 375
Foreign currency translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (4,603) (3,114)
Reclassifications to retained earnings upon adoption of new accounting standards   (65)
Other comprehensive income, net before reclassifications (534) (776)
Ending Balance (5,137) (3,955)
Defined benefit pension plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (816) (420)
Reclassifications to retained earnings upon adoption of new accounting standards   36
Other comprehensive income, net before reclassifications (18) (33)
Reclassifications before income taxes 68 101
Applicable income taxes (17) (25)
Ending Balance (783) (341)
Other AOCI transactions [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 34 12
Reclassifications to retained earnings upon adoption of new accounting standards   (6)
Other comprehensive income, net before reclassifications (32) (19)
Reclassifications before income taxes 6 10
Applicable income taxes (3) (3)
Ending Balance 5 (6)
Accumulated other comprehensive income [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (5,015) 58,571
Reclassifications to retained earnings upon adoption of new accounting standards   (61,375)
Ending Balance $ (5,408) $ (3,927)