Commitments: (Tables)

9 Months Ended

Sep. 30, 2013

Commitments:

Changes in warranty liabilities

Standard Warranty Liability
(Dollars in millions)	2013		2012
Balance at January 1	$	394	$	407
Current period accruals		238		270
Accrual adjustments to reflect actual experience		21		(18)
Charges incurred		(292)		(295)
Balance at September 30	$	362	$	364

Extended Warranty Liability
(Dollars in millions)	2013		2012
Aggregate deferred revenue at January 1	$	606	$	636
Revenue deferred for new extended warranty contracts		204		191
Amortization of deferred revenue		(244)		(240)
Other*		(7)		—
Aggregate deferred revenue at September 30	$	559	$	587
Current portion	$	283	$	284
Noncurrent portion		276		302
Aggregate deferred revenue at September 30	$	559	$	587
* Other primarily consists of foreign currency translation adjustments.