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Income taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current provision:
Federal	$ 921	$ 1,284	$ 1,270
State	34	39	17
Foreign	277	277	227
Total current provision	1,232	1,600	1,514
Deferred (benefit) provision:
Federal	(321)	(276)	(317)
State	9	(22)	(7)
Foreign	(51)	(6)	(39)
Total deferred benefit	(363)	(304)	(363)
Total provision for income taxes	$ 869	$ 1,296	$ 1,151

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