Segments: (Revenue by segments) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Revenue
Revenue	$ 22,397	$ 23,338	[1]	$ 68,680	$ 70,982	[1]
Total reportable segments
Revenue
Revenue	24,334	25,079	[2]	74,635	76,314	[2]
Eliminations of internal transactions
Revenue
Revenue	(2,029)	(1,863)	[2]	(6,248)	(5,710)	[2]
Other revenue adjustments
Revenue
Revenue	$ 92	$ 122	[2]	$ 292	$ 378	[2]

[1] Reclassified to reflect discontinued operations presentation. See note 1 on page 9 for additional information.

[2] Reclassified to reflect discontinued operations presentation.