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Revolving Credit Facility (Notes)
6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Debt Disclosure [Text Block]
In April 2013, we amended our $2.0 billion five-year revolving credit facility expiring in 2016. The amendment increased the facility from $2.0 billion to $3.0 billion and extended the expiration to 2018. The purpose of the facility is to provide general working capital and credit for other corporate purposes. The full amount of the facility was available as of June 30, 2013.