Restructuring-Related Liabilities: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Current Liability
Restructuring Reserve
Liability at the beginning of the period	$ 27
Payments	(7)
Other Adjustments	8	[1]
Liability at the end of the period	28
Noncurrent Liability
Restructuring Reserve
Liability at the beginning of the period	440
Other Adjustments	(3)	[1]
Liability at the end of the period	437
Workforce | Current Liability
Restructuring Reserve
Liability at the beginning of the period	27
Payments	(7)
Other Adjustments	8	[1]
Liability at the end of the period	28
Workforce | Noncurrent Liability
Restructuring Reserve
Liability at the beginning of the period	440
Other Adjustments	(3)	[1]
Liability at the end of the period	$ 437

[1] Other Adjustments principally include the reclassification of noncurrent to current, remeasurement of actuarial assumptions, foreign currency translation adjustments and interest accretion.