Credit Quality of Long-term Receivables (Tables)

9 Months Ended

Sep. 30, 2013

Notes to Condensed Consolidated Financial Statements [Abstract]

Financing Receivable Credit Quality Indicators [Table Text Block]

	September 30, 2013				December 31, 2012
(Dollars in millions)	Long-term trade accounts receivable		Notes and leases receivable		Long-term trade accounts receivable		Notes and leases receivable
A - (low risk, collateralized/uncollateralized)	$	607	$	30	$	569	$	26
B - (moderate risk, collateralized/uncollateralized)	20		478		21		458
C - (high risk, collateralized/uncollateralized)	3		122		3		100
D - (in default, uncollateralized)	—		—		—		—
Total	$	630	$	630	$	593	$	584

(Dollars in millions)	September 30, 2013		December 31, 2012
Long-term trade accounts receivable	$	630	$	593
Notes and leases receivable	630		584
Total long-term receivables	$	1,260	$	1,177

Allowance for Credit Losses on Financing Receivables [Table Text Block]

(Dollars in millions)	2013			2012
Beginning balance of the reserve for credit losses and exposure as of January 1	$	60		$	70
Provision	7			1
Charge-offs	(13		)	—
Recoveries	(1		)	(5		)
Other	(3		)	(5		)
Ending balance of the reserve for credit losses and exposure: individually evaluated for impairment as of September 30	$	50		$	61
Ending balance of long-term receivables: individually evaluated for impairment as of September 30	$	1,260		$	1,036