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Assets Held For Sale (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2015
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Assets Held-for-sale [Line Items]                
Assets held for sale   $ 3       $ 5 $ 3 $ 5
Impaired Intangible Asset, Description               1
Gain on assets held for sale   0 $ 0 $ 1 $ 1      
Consorcio Candonga [Member]                
Assets Held-for-sale [Line Items]                
Gain on assets held for sale               $ 23
South America [Member]                
Assets Held-for-sale [Line Items]                
Assets held for sale           1   1
Gain on assets held for sale, net           6    
North America [Member]                
Assets Held-for-sale [Line Items]                
Gain on assets held for sale, net               7
Hydroelectric Assets [Member]                
Assets Held-for-sale [Line Items]                
Loss on sale of assets $ 14              
South America [Member]                
Assets Held-for-sale [Line Items]                
Assets held for sale   $ 3       $ 4 3 $ 4
Ouro Preto, Brazil [Member]                
Assets Held-for-sale [Line Items]                
Gain on assets held for sale, net             $ (1)