Commitments: (Tables)

3 Months Ended

Mar. 31, 2012

Commitments:

Changes in warranty liabilities

(Dollars in millions)	2012			2011
Balance at January 1	$	407		$	375
Current period accruals	88			93
Accrual adjustments to reflect actual experience	(3		)	3
Charges incurred	(102		)	(105		)
Balance at March 31	$	390		$	366

(Dollars in millions)	2012			2011
Aggregate deferred revenue at January 1	$	636		$	670
Revenue deferred for new extended warranty contracts	54			66
Amortization of deferred revenue	(76		)	(84		)
Other*	3			5
Aggregate deferred revenue at March 31	$	616		$	658
Current portion	$	292		$	319
Noncurrent portion	323			338
Aggregate deferred revenue at March 31	$	616		$	658

* Other primarily consists of foreign currency translation adjustments.