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Accumulated other comprehensive income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 424,791  
Other comprehensive income, net (1,478) $ 288
Ending Balance 371,565  
Unrealized appreciation of investments, net [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 481 370
Other comprehensive income, net (139) 93
Ending Balance 342 463
Foreign currency translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (4,346) (4,603)
Other comprehensive income, net (1,362) 157
Ending Balance (5,708) (4,446)
Defined benefit pension plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,369) (816)
Other comprehensive income, net 71 50
Ending Balance (1,298) (766)
Other AOCI transactions [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (9) 34
Other comprehensive income, net (48) (12)
Ending Balance (57) 22
Accumulated other comprehensive income [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (5,243) (5,015)
Ending Balance $ (6,721) $ (4,727)