Commitments: (Tables)

3 Months Ended

Mar. 31, 2013

Commitments:

Changes in warranty liabilities

Standard Warranty Liability

(Dollars in millions)	2013			2012
Balance at January 1	$	394		$	407
Current period accruals	71			88
Accrual adjustments to reflect actual experience	9			(3		)
Charges incurred	(93		)	(102		)
Balance at March 31	$	381		$	390

Extended Warranty Liability

(Dollars in millions)	2013			2012
Aggregate deferred revenue at January 1	$	606		$	636
Revenue deferred for new extended warranty contracts	47			54
Amortization of deferred revenue	(82		)	(76		)
Other*	(7		)	3
Aggregate deferred revenue at March 31	$	565		$	616
Current portion	$	286		$	292
Noncurrent portion	278			323
Aggregate deferred revenue at March 31	$	565		$	616

* Other primarily consists of foreign currency translation adjustments.