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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance $ (191) $ (213) $ (188) $ (173) $ (178) $ 111 $ (188) $ 111  
Other comprehensive income (loss) before reclassifications 6 15 (35) 10 (1) (24)      
Amounts reclassified from AOCI 4 7 11 6 6 5      
Total other comprehensive income, net of tax 10 22 (24) 16 [1] 5 (19) 8 2 [1]  
Acquisition of Gulf Power     (1)            
Impact of NEP deconsolidation 0     0 [1]   58 0 58 [1]  
Adoption of accounting standards updates                 $ (328)
Ending balance (181) (191) (213) (157) (173) (178) (181) (157)  
Net Unrealized Gains (Losses) on Cash Flow Hedges                  
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance (38) (46) (55) (67) (74) (77) (55) (77)  
Other comprehensive income (loss) before reclassifications 0 0 0 0 0 0      
Amounts reclassified from AOCI 6 8 10 7 7 7      
Total other comprehensive income, net of tax 6 8 10 7 7 7      
Acquisition of Gulf Power     (1)            
Impact of NEP deconsolidation           3      
Adoption of accounting standards updates                 (7)
Ending balance (32) (38) (46) (60) (67) (74) (32) (60)  
Net Unrealized Gains (Losses) on Available for Sale Securities                  
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance 9 3 (7) (5) (2) 316 (7) 316  
Other comprehensive income (loss) before reclassifications 4 7 8 (2) (3) (5)      
Amounts reclassified from AOCI (1) (1) 2 0 0 (1)      
Total other comprehensive income, net of tax 3 6 10 (2) (3) (6)      
Acquisition of Gulf Power     0            
Impact of NEP deconsolidation           0      
Adoption of accounting standards updates                 (312)
Ending balance 12 9 3 (7) (5) (2) 12 (7)  
Defined Benefit Pension and Other Benefits Plans                  
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance (119) (118) (65) (51) (50) (39) (65) (39)  
Other comprehensive income (loss) before reclassifications 0 (1) (52) 0 0 (1)      
Amounts reclassified from AOCI (1) 0 (1) (1) (1) (1)      
Total other comprehensive income, net of tax (1) (1) (53) (1) (1) (2)      
Acquisition of Gulf Power     0            
Impact of NEP deconsolidation           0      
Adoption of accounting standards updates                 (9)
Ending balance (120) (119) (118) (52) (51) (50) (120) (52)  
Net Unrealized Gains (Losses) on Foreign Currency Translation                  
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance (45) (53) (63) (52) (52) (69) (63) (69)  
Other comprehensive income (loss) before reclassifications 1 8 10 11 0 (20)      
Amounts reclassified from AOCI 0 0 0 0 0 0      
Total other comprehensive income, net of tax 1 8 10 11 0 (20)      
Acquisition of Gulf Power     0            
Impact of NEP deconsolidation           37      
Adoption of accounting standards updates                 0
Ending balance (44) (45) (53) (41) (52) (52) (44) (41)  
Other Comprehensive Income (Loss) Related to Equity Method Investees                  
AOCI Attributable to Parent, Net of Tax [Roll Forward]                  
Beginning balance 2 1 2 2 0 (20) 2 (20)  
Other comprehensive income (loss) before reclassifications 1 1 (1) 1 2 2      
Amounts reclassified from AOCI 0 0 0 0 0 0      
Total other comprehensive income, net of tax 1 1 (1) 1 2 2      
Acquisition of Gulf Power     0            
Impact of NEP deconsolidation           18      
Adoption of accounting standards updates                 $ 0
Ending balance $ 3 $ 2 $ 1 $ 3 $ 2 $ 0 $ 3 $ 3  
[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.