Contingencies and Commitments (Tables)

3 Months Ended

Mar. 31, 2012

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	$	352	21	<$1 - $53
Letters of credit under the senior secured credit facility		12	11	<$1 - $7
Cash collateralized letters of credit		254	13	<$1 - $215
Total	$	618	45