Credit Quality of Long-term Receivables (Tables)

6 Months Ended

Jun. 30, 2013

Notes to Condensed Consolidated Financial Statements [Abstract]

Financing Receivable Credit Quality Indicators [Table Text Block]

	June 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)	$	584	$	32	$	569	$	26
B - (moderate risk, collateralized/uncollateralized)	21		427		21		458
C - (high risk, collateralized/uncollateralized)	3		144		3		100
D - (in default, uncollateralized)	—		—		—		—
Total	$	608	$	603	$	593	$	584

(Dollars in millions)	June 30, 2013		December 31, 2012
Long-term trade accounts receivable	$	608	$	593
Notes and leases receivable	603		584
Total long-term receivables	$	1,211	$	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	4			1
Charge-offs	(13		)	—
Recoveries	(1		)	(1		)
Other	(2		)	(4		)
Ending balance of the reserve for credit losses and exposure: individually evaluated for impairment as of June 30	$	48		$	66
Ending balance of long-term receivables: individually evaluated for impairment as of June 30	$	1,211		$	739