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Other Non-Operating Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Innovent [Member]
Dec. 31, 2011
Innovent [Member]
Dec. 31, 2010
Innovent [Member]
Sep. 30, 2011
Yangcheng [Member]
integer
Dec. 31, 2012
Other Nonoperating Other [Member]
Dec. 31, 2011
Other Nonoperating Other [Member]
Dec. 31, 2010
Other Nonoperating Other [Member]
Dec. 31, 2012
China Generation [Member]
Dec. 31, 2011
China Generation [Member]
Dec. 31, 2010
China Generation [Member]
Component of Other Expense, Nonoperating [Line Items]                          
Other non-operating expense $ 50 $ 82 $ 7 $ 17 $ 0 $ 0   $ 1 $ 3 $ 7 $ 32 $ 79 $ 0
Effective Ownership %             25.00%            
Generation Capacity (MW)       75     2,100            
Fair Value of nonrecurring measurement 35     19     26       133    
Carrying Amount       $ 36     $ 100       $ 165