Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Intangible Assets Including Goodwill:
Net carrying amount increase/(decrease)			$ (286)
Intangible asset amortization expense	340	326	679	657
Intangible assets retired and fully amortized			$ 337