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Goodwill and other intangible assets Intangible Assets Acquiredd as part of Chubb acquisition (Details) - USD ($)
$ in Millions
9 Months Ended
Jan. 14, 2016
Sep. 30, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]    
Total identified intangible assets acquired $ 7,655  
Internally developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life   3 years
Internally developed technology | The Chubb Corporation [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired   $ 95
Agency distribution relationships and renewal rights [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life   24 years
Agency distribution relationships and renewal rights [Member] | The Chubb Corporation [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired   $ 3,150
Unearned premium reserves [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life   1 year
Unearned premium reserves [Member] | The Chubb Corporation [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired   $ 1,550
Maximum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life   24 years
Minimum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life   1 year
Trademarks [Member] | The Chubb Corporation [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets Acquired   $ 2,800
Licensing Agreements [Member] | The Chubb Corporation [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets Acquired   50
Syndicate capacity [Member] | The Chubb Corporation [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets Acquired   $ 10