Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Receivable

Schedule of the entity's accounts receivable balances

	Successor
	December 31, 2012			December 31, 2011(1)
	(Dollars in millions)
Trade and purchased receivables	$	1,028			1,015
Earned and unbilled receivables		208			217
Other		17			31
Total accounts receivable		1,253			1,263
Less: allowance for doubtful accounts		(76	)		(62	)
Accounts receivable, less allowance	$	1,177			1,201

Schedule of the entity's allowance for doubtful accounts

	Allowance for Doubtful Accounts
	(Dollars in millions)
Balance at January 1, 2010 (Predecessor)	$	100
Charged to expense—net		86
Deductions		(103	)
Balance at December 31, 2010 (Predecessor)		83
Charged to expense—net		19
Deductions		(22	)
Balance at March 31, 2011 (Predecessor)	$	80
Fair value adjustment		(80	)
Balance at April 1, 2011 (Successor)	$	—
Charged to expense—net		62
Deductions		—
Balance at December 31, 2011 (Successor)		62
Charged to expense—net		94
Deductions		(78	)
Adjustments		(2	)
Balance at December 31, 2012 (Successor)	$	76