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Fair Value (Nonrecurring Measurements) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 09, 2015
Mar. 31, 2016
Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other Asset Impairment Charges   $ 159 $ 8
Other Nonoperating Expense   2 0
Available-for-sale Securities, Gross Realized Gain (Loss)   1 1
Long Lived Assets Held And Used [Member] | Other Entity [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other Asset Impairment Charges [1]     8
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other Asset Impairment Charges [1]   159  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 1 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1]     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 2 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1]     21
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 3 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1]     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 1 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1]   0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 2 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1]   0  
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Entity [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1],[2]     $ 29
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | buffalo gap II [Member] [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [1],[2]   251  
Equity Method Investments [Member] | Solar Spain [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other Nonoperating Expense $ 0    
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 1 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring 0    
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 2 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring 0    
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 3 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring 29    
Equity Method Investments [Member] | Carrying Amount [Member] | Solar Spain [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring [2] $ 29    
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 3 [Member]      
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring   $ 92  
[1] See Note 13—Asset Impairment Expense for further information.
[2] (1) Represents the carrying values at the dates of measurement, before fair value adjustment.