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Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (Numerator):                      
Net income for basic and diluted EPS $ 1,928 $ 1,859 $ 2,296 $ 2,311 $ (4,264) $ 2,021 $ 2,151 $ 2,071 $ 8,394 $ 1,979 $ 7,722
Shares (Denominator):                      
Weighted-average shares for basic EPS                 661 731 748
Effect of dilutive securities (in shares)                 4 4 6
Weighted-average shares for diluted EPS                 665 735 754
Basic EPS (in usd per share) $ 3.04 $ 2.88 $ 3.50 $ 3.27 $ (5.89) $ 2.78 $ 2.93 $ 2.81 $ 12.70 $ 2.71 $ 10.32
Diluted EPS (in usd per share) $ 3.01 $ 2.86 $ 3.48 $ 3.25 $ (5.89) $ 2.76 $ 2.91 $ 2.79 $ 12.62 $ 2.69 $ 10.24