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Income taxes (Reconciliation of Total Gross Amounts of UTBs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of total gross amounts of unrecognized tax benefits (excluding interest, penalties, foreign tax credits and the federal tax benefit of state taxes related to unrecognized tax benefits)
Beginning balance	$ 2,953	$ 2,543	$ 2,114
Additions based on tax positions related to the current year	173	447	425
Additions based on tax positions related to prior years	13	1	18
Reductions for tax positions of prior years	(17)	(5)	(7)
Reductions for expiration of statute of limitations	0	(5)	0
Settlements	(61)	(28)	(7)
Ending balance	$ 3,061	$ 2,953	$ 2,543

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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