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Financings And Capitalization (Contingently Convertible Securities) (Details) (Senior Notes 5.5% Due June 2029 [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Senior Notes 5.5% Due June 2029 [Member]
 
Maturity Date 2029
Outstanding $ 172
Adjusted Conversion Price $ 13.74
Adjusted Trigger Price $ 17.86
Interest rate 5.50%