Accounts Receivable

3 Months Ended

Mar. 31, 2015

Accounts Receivable [Abstract]

Accounts Receivable

(4)   Accounts Receivable:

The components of accounts receivable, net are as follows:

($ in millions)	March 31, 2015		December 31, 2014
Retail and Wholesale	$	539	$	630
Other		46		56
Less: Allowance for doubtful accounts		(59)		(72)
Accounts receivable, net	$	526	$	614

We maintain an allowance for doubtful accounts based on our estimate of our ability to collect accounts receivable. Bad debt expense, which is recorded as a reduction to revenue, was $13 million for each of the three months ended March 31, 2015 and 2014, respectively. Our allowance for doubtful accounts declined in the first quarter of 2015, primarily as a result of the resolution of a principal carrier dispute.