v3.6.0.2
Income taxes - Provision (benefit) for income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
U.S. federal - Current $ 1,289 $ 1,110 $ 911
Non-U.S. - Current 238 168 194
U.S. state - Current 10 7 9
Total current income tax expense (benefit) 1,537 1,285 1,114
U.S. federal - Deferred (122) (72) (73)
Non-U.S. - Deferred (80) 14 11
U.S. state - Deferred 0 3 1
Total deferred income tax expense (benefit) (202) (55) (61)
Total U.S. federal income taxes 1,167 1,038 838
Total Non-U.S. income taxes 158 182 205
Total U.S. state income taxes 10 10 10
Provision for income taxes $ 1,335 $ 1,230 $ 1,053