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Income taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current provision:
Federal	$ 1,270	$ 8,615	$ 984
State	17	5	65
Foreign	227	275	176
Total current provision	1,514	8,895	1,225
Deferred (benefit) provision:
Federal	(317)	(1,120)	372
State	(7)	0	(69)
Foreign	(39)	(157)	(87)
Total deferred (benefit) provision	(363)	(1,277)	216
Total provision for income taxes	$ 1,151	$ 7,618	$ 1,441

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