Commitments: (Tables)

6 Months Ended

Jun. 30, 2013

Commitments:

Changes in warranty liabilities

Standard Warranty Liability

(Dollars in millions)	2013			2012
Balance at January 1	$	394		$	407
Current period accruals	163			181
Accrual adjustments to reflect actual experience	11			(9		)
Charges incurred	(192		)	(199		)
Balance at June 30	$	376		$	380

Extended Warranty Liability

(Dollars in millions)	2013			2012
Aggregate deferred revenue at January 1	$	606		$	636
Revenue deferred for new extended warranty contracts	119			127
Amortization of deferred revenue	(148		)	(155		)
Other*	(11		)	(6		)
Aggregate deferred revenue at June 30	$	567		$	602
Current portion	$	271		$	288
Noncurrent portion	296			314
Aggregate deferred revenue at June 30	$	567		$	602

* Other primarily consists of foreign currency translation adjustments.