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Investments In and Advances To Affiliates - Summary of Financial Information of Affiliates & Subsidiaries (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 09, 2018
Jan. 01, 2018
Nov. 15, 2017
Jul. 25, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 16, 2016
Investments in and Advances to Affiliates [Line Items]                          
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (1,857,000,000)     $ (2,071,000,000)         $ (2,071,000,000) $ (1,876,000,000) $ (2,756,000,000)  
Investments in and advances to affiliates         1,114,000,000         1,114,000,000 1,197,000,000 621,000,000  
Gain (Loss) on Disposition of Business         $ 128,000,000 $ (21,000,000) $ 89,000,000 $ 788,000,000 $ (48,000,000) 984,000,000 (52,000,000) 29,000,000  
Equity Method Investment, Other than Temporary Impairment                   144,000,000      
Payments to Acquire Businesses and Interest in Affiliates                   66,000,000 609,000,000 52,000,000  
Proceeds from the sale of business interests, net of cash and restricted cash sold                   2,020,000,000 108,000,000 538,000,000  
Net equity in earnings of affiliates                   $ 39,000,000 71,000,000 36,000,000  
Barry                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage         100.00%         100.00%      
Distributed Energy [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Payments to Acquire Businesses, Net of Cash Acquired                   $ 23,000,000      
Business Combination, Equity Interest in Acquiree, Remeasurement Gain (Loss)         $ 5,000,000         5,000,000      
Business Combination, Consideration Transferred                         $ 43,000,000
Simple Energy [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Payments to Acquire Businesses, Net of Cash Acquired $ 35,000,000                        
Fluence [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Business Acquisition, Percentage of Voting Interests Acquired   50.00%                      
Payments to Acquire Interest in Joint Venture   $ 7,000,000                      
Business Combination, Consideration Transferred   50,000,000                      
sPower [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage     2.00% 48.00%                  
Payments to Acquire Businesses, Net of Cash Acquired     $ 19,000,000 $ 461,000,000                  
Non-cash [Member] | Fluence [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Contribution of Property   $ 20,000,000               20,000,000 $ 0 $ 0  
Fair Value, Inputs, Level 3 [Member] | Long Lived Assets Held For Sale [Member] | guacolda [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Assets Carrying Amount Disclosure Nonrecurring         $ 209,000,000         $ 209,000,000