Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Contingencies And Commitments Tables [Abstract]

Contingent Contractual Obligations

Contingent contractual obligations	Amount		Number of Agreements	Maximum Exposure Range for Each Agreement
	(in millions)			(in millions)
Guarantees	$	351	22	<$1 - $53
Letters of credit under the senior secured credit facility		12	11	<$1 - $7
Cash collateralized letters of credit		261	13	<$1 - $221
Total	$	624	46