XML 50 R62.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Commitments and Contingencies    
Letters of credit outstanding $ 77 $ 71
Number of US pension plans that are a LOC beneficiary 1