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Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Appalachian Power Co [Member]
AEP Texas Inc. [Member]
AEP Transmission Co [Member]
Indiana Michigan Power Co [Member]
Ohio Power Co [Member]
Public Service Co Of Oklahoma [Member]
Southwestern Electric Power Co [Member]
Common Stock [Member]
Common Stock [Member]
Appalachian Power Co [Member]
Common Stock [Member]
Indiana Michigan Power Co [Member]
Common Stock [Member]
Ohio Power Co [Member]
Common Stock [Member]
Public Service Co Of Oklahoma [Member]
Common Stock [Member]
Southwestern Electric Power Co [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Appalachian Power Co [Member]
Additional Paid-in Capital [Member]
AEP Texas Inc. [Member]
Additional Paid-in Capital [Member]
AEP Transmission Co [Member]
Additional Paid-in Capital [Member]
Indiana Michigan Power Co [Member]
Additional Paid-in Capital [Member]
Ohio Power Co [Member]
Additional Paid-in Capital [Member]
Public Service Co Of Oklahoma [Member]
Additional Paid-in Capital [Member]
Southwestern Electric Power Co [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Appalachian Power Co [Member]
Retained Earnings [Member]
AEP Texas Inc. [Member]
Retained Earnings [Member]
AEP Transmission Co [Member]
Retained Earnings [Member]
Indiana Michigan Power Co [Member]
Retained Earnings [Member]
Ohio Power Co [Member]
Retained Earnings [Member]
Public Service Co Of Oklahoma [Member]
Retained Earnings [Member]
Southwestern Electric Power Co [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income [Member]
Appalachian Power Co [Member]
Accumulated Other Comprehensive Income [Member]
AEP Texas Inc. [Member]
Accumulated Other Comprehensive Income [Member]
Indiana Michigan Power Co [Member]
Accumulated Other Comprehensive Income [Member]
Ohio Power Co [Member]
Accumulated Other Comprehensive Income [Member]
Public Service Co Of Oklahoma [Member]
Accumulated Other Comprehensive Income [Member]
Southwestern Electric Power Co [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Southwestern Electric Power Co [Member]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2018       $ 3,569.8                           $ 2,480.6               $ 1,089.2                              
Beginning Balance at Dec. 31, 2018 $ 19,059.4 $ 4,006.1 $ 2,580.5   $ 2,352.8 $ 2,297.4 $ 1,248.0 $ 2,315.6 $ 3,337.4 $ 260.4 $ 56.6 $ 321.2 $ 157.2 $ 135.7 $ 6,486.1 $ 1,828.7 $ 1,257.9   $ 980.9 $ 838.8 $ 364.0 $ 676.6 $ 9,325.3 $ 1,922.0 $ 1,337.7   $ 1,329.1 $ 1,136.4 $ 724.7 $ 1,508.4 $ (120.4) $ (5.0) $ (15.1) $ (13.8) $ 1.0 $ 2.1 $ (5.4) $ 31.0 $ 0.3    
Beginning Balance, Shares at Dec. 31, 2018                 513,500,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Issuance of Common Stock, Value 14.5               $ 1.2           13.3                                                    
Issuance of Common Stock, Shares                 100,000                                                                
Common Stock Dividends (333.6)                                           (332.5) [1]                                    
Common Stock Dividends   (50.0)     (20.0) (25.0) (11.3) (18.7)                               (50.0)     (20.0) (25.0) (11.3) (18.7)                      
Common Stock Dividends               (1.1)                                                           (1.1) (1.1)    
Other Changes in Equity (55.6)                           (56.6) [2]                                             1.0      
Capital Contribution from Member     200.0                           200.0                                                
Net Income (Loss)                                             572.8             27.8                      
Net Income (Loss) Attributable to Noncontrolling Interests                                                                           1.3 1.2    
Net Income (Loss) 574.1 133.7 34.4 104.3 98.9 128.0 6.2 29.0                               133.7 34.4 104.3 98.9 128.0 6.2                        
Other Comprehensive Income (Loss) (30.3) (0.8) 0.3   0.4 (0.3) (0.2) 0.1                                             (30.3) (0.8) 0.3 0.4 (0.3) (0.2) 0.1        
Ending Balance at Mar. 31, 2019       3,674.1                           2,480.6               1,193.5                              
Ending Balance at Mar. 31, 2019 $ 19,228.5 4,089.0 2,815.2   2,432.1 2,400.1 1,242.7 2,324.9 $ 3,338.6 260.4 56.6 321.2 157.2 135.7 6,442.8 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,565.6 2,005.7 1,372.1   1,408.0 1,239.4 719.6 1,517.5 (150.7) (5.8) (14.8) (13.4) 0.7 1.9 (5.3) 32.2 0.4    
Ending Balance, Shares at Mar. 31, 2019                 513,600,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Common Stock, Dividends Per Share, Declared $ 0.67                                                                                
Beginning Balance at Dec. 31, 2018       3,569.8                           2,480.6               1,089.2                              
Beginning Balance at Dec. 31, 2018 $ 19,059.4 4,006.1 2,580.5   2,352.8 2,297.4 1,248.0 2,315.6 $ 3,337.4 260.4 56.6 321.2 157.2 135.7 6,486.1 1,828.7 1,257.9   980.9 838.8 364.0 676.6 9,325.3 1,922.0 1,337.7   1,329.1 1,136.4 724.7 1,508.4 (120.4) (5.0) (15.1) (13.8) 1.0 2.1 (5.4) 31.0 0.3    
Beginning Balance, Shares at Dec. 31, 2018                 513,500,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Other Changes in Equity                                             (62.0)                                    
Dividends Paid on Common Stock   (100.0)   0.0 (40.0) (85.0) (11.3) (37.5)                                                                  
Net Income (Loss) 1,034.1             34.0                                                                  
Net Income (Loss) Attributable to Noncontrolling Interests (0.9)             2.3                                                                  
Net Income (Loss) 1,033.2 189.2 115.0 240.3 159.2 178.6 48.1 36.3                                                                  
Other Comprehensive Income (Loss) (110.3) (1.7) 0.6   0.7     0.2                                                                  
Ending Balance at Jun. 30, 2019       3,810.1                           2,480.6               1,329.5                              
Ending Balance at Jun. 30, 2019 19,423.2 4,093.6 2,896.1   2,472.7 2,390.3 1,284.3 2,312.4 $ 3,340.8 260.4 56.6 321.2 157.2 135.7 6,455.3 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,694.2 2,011.2 1,452.7   1,448.3 1,230.0 761.5 1,504.9 (230.7) (6.7) (14.5) (13.1) 0.3 1.6 (5.2) 163.6 0.4    
Ending Balance, Shares at Jun. 30, 2019                 514,000,000.0                                                                
Beginning Balance at Mar. 31, 2019       3,674.1                           2,480.6               1,193.5                              
Beginning Balance at Mar. 31, 2019 19,228.5 4,089.0 2,815.2   2,432.1 2,400.1 1,242.7 2,324.9 $ 3,338.6 260.4 56.6 321.2 157.2 135.7 6,442.8 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,565.6 2,005.7 1,372.1   1,408.0 1,239.4 719.6 1,517.5 (150.7) (5.8) (14.8) (13.4) 0.7 1.9 (5.3) 32.2 0.4    
Beginning Balance, Shares at Mar. 31, 2019                 513,600,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Issuance of Common Stock, Value 17.8               $ 2.2           15.6                                                    
Issuance of Common Stock, Shares                 400,000                                                                
Common Stock Dividends (334.5)                                           (332.7) [1]                                    
Common Stock Dividends   (50.0)     (20.0) (60.0)   (18.8)                               (50.0)     (20.0) (60.0)   (18.8)                      
Common Stock Dividends               (1.1)                                                           (1.8) (1.1)    
Other Changes in Equity (2.5)                           (3.1)                                             0.6      
Acquisition                                                                               $ 134.8 $ 134.8
Net Income (Loss) 461.3             6.2                             461.3             6.2                      
Net Income (Loss) Attributable to Noncontrolling Interests (2.2)             1.1                                                           (2.2) 1.1    
Net Income (Loss) 459.1 55.5 80.6 136.0 60.3 50.6 41.9 7.3                               55.5 80.6 136.0 60.3 50.6 41.9                        
Other Comprehensive Income (Loss) (80.0) (0.9) 0.3   0.3 (0.4) (0.3) 0.1                                             (80.0) (0.9) 0.3 0.3 (0.4) (0.3) 0.1        
Ending Balance at Jun. 30, 2019       3,810.1                           2,480.6               1,329.5                              
Ending Balance at Jun. 30, 2019 $ 19,423.2 4,093.6 2,896.1   2,472.7 2,390.3 1,284.3 2,312.4 $ 3,340.8 260.4 56.6 321.2 157.2 135.7 6,455.3 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,694.2 2,011.2 1,452.7   1,448.3 1,230.0 761.5 1,504.9 (230.7) (6.7) (14.5) (13.1) 0.3 1.6 (5.2) 163.6 0.4    
Ending Balance, Shares at Jun. 30, 2019                 514,000,000.0                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Common Stock, Dividends Per Share, Declared $ 0.67                                                                                
Beginning Balance at Dec. 31, 2019       4,009.5                           2,480.6               1,528.9                              
Beginning Balance at Dec. 31, 2019 $ 19,913.2 4,172.4 2,961.1   2,544.4 2,508.5 $ 1,373.3 2,441.1 $ 3,343.4 260.4 56.6 321.2 157.2 135.7 6,535.6 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,900.9 2,078.3 1,516.0   1,518.5 1,348.5 851.0 1,629.5 (147.7) 5.0 (12.8) (11.6) 0.0 1.1 (1.3) 281.0 0.6    
Beginning Balance, Shares at Dec. 31, 2019 514,373,631           10,482,000   514,400,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Issuance of Common Stock, Value $ 56.1               $ 6.8           49.3                                                    
Issuance of Common Stock, Shares                 1,000,000.0                                                                
Common Stock Dividends (363.7)                                           (359.1) [3]                                    
Common Stock Dividends   (50.0)     (21.3) (21.9)                                   (50.0)     (21.3) (21.9)                          
Common Stock Dividends               (0.7)                                                           (4.6) (0.7)    
Other Changes in Equity (30.2)                           (29.0)                                             (1.2)      
ASU 2016-13 Adoption 1.8       0.4 (0.3) $ (0.3) (1.6)                             1.8       0.4 (0.3) (0.3) (1.6)                      
Capital Contribution from Member       185.0                           185.0                                              
Net Income (Loss)                                             495.2             15.1                      
Net Income (Loss) Attributable to Noncontrolling Interests                                                                           4.1 1.0    
Net Income (Loss) 499.3 115.3 47.6 117.8 92.3 75.1 (10.3) 16.1                               115.3 47.6 117.8 92.3 75.1 (10.3)                        
Other Comprehensive Income (Loss) (68.8) (5.1) 0.3   0.4   (0.2)                                               (68.8) (5.1) 0.3 0.4   (0.2)          
Ending Balance at Mar. 31, 2020       4,312.3                           2,665.6               1,646.7                              
Ending Balance at Mar. 31, 2020 $ 20,007.7 4,232.6 3,009.0   2,616.2 2,562.0 1,363.1 2,458.1 $ 3,350.2 260.4 56.6 321.2 157.2 135.7 6,555.9 1,828.7 1,457.9   980.9 838.8 364.0 676.6 10,038.8 2,143.6 1,563.6   1,589.9 1,402.0 841.0 1,646.2 (216.5) (0.1) (12.5) (11.2) 0.0 0.9 (1.3) 279.3 0.9    
Ending Balance, Shares at Mar. 31, 2020                 515,400,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Common Stock, Dividends Per Share, Declared $ 0.70                                                                                
Beginning Balance at Dec. 31, 2019       4,009.5                           2,480.6               1,528.9                              
Beginning Balance at Dec. 31, 2019 $ 19,913.2 4,172.4 2,961.1   2,544.4 2,508.5 $ 1,373.3 2,441.1 $ 3,343.4 260.4 56.6 321.2 157.2 135.7 6,535.6 1,828.7 1,457.9   980.9 838.8 364.0 676.6 9,900.9 2,078.3 1,516.0   1,518.5 1,348.5 851.0 1,629.5 (147.7) 5.0 (12.8) (11.6) 0.0 1.1 (1.3) 281.0 0.6    
Beginning Balance, Shares at Dec. 31, 2019 514,373,631           10,482,000   514,400,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Dividends Paid on Common Stock   (100.0)   (5.0) (42.5) (43.8) $ 0.0 0.0                                                                  
Net Income (Loss) $ 1,016.0             73.9                                                                  
Net Income (Loss) Attributable to Noncontrolling Interests (2.2)             1.4                                                                  
Net Income (Loss) 1,013.8 196.6 114.5 191.5 156.1 156.0 36.1 75.3                                                                  
Other Comprehensive Income (Loss) (25.2) (6.9) 0.6   0.8     0.0                                                                  
Ending Balance at Jun. 30, 2020       4,381.0                           2,665.6               1,715.4                              
Ending Balance at Jun. 30, 2020 $ 20,278.2 4,262.1 3,076.2   2,659.2 2,621.0 $ 1,409.2 2,516.1 $ 3,355.4 260.4 56.6 321.2 157.2 135.7 6,603.0 1,828.7 1,457.9   980.9 838.8 364.0 676.6 10,221.9 2,174.9 1,630.5   1,632.5 1,461.0 887.4 1,705.0 (172.9) (1.9) (12.2) (10.8) 0.0 0.6 (1.3) 270.8 0.1    
Ending Balance, Shares at Jun. 30, 2020 516,214,732           10,482,000   516,200,000                                                                
Beginning Balance at Mar. 31, 2020       4,312.3                           2,665.6               1,646.7                              
Beginning Balance at Mar. 31, 2020 $ 20,007.7 4,232.6 3,009.0   2,616.2 2,562.0 $ 1,363.1 2,458.1 $ 3,350.2 260.4 56.6 321.2 157.2 135.7 6,555.9 1,828.7 1,457.9   980.9 838.8 364.0 676.6 10,038.8 2,143.6 1,563.6   1,589.9 1,402.0 841.0 1,646.2 (216.5) (0.1) (12.5) (11.2) 0.0 0.9 (1.3) 279.3 0.9    
Beginning Balance, Shares at Mar. 31, 2020                 515,400,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Issuance of Common Stock, Value 54.9               $ 5.2           49.7                                                    
Issuance of Common Stock, Shares                 800,000                                                                
Common Stock Dividends (340.9)                                           (337.7) [3]                                    
Common Stock Dividends   (50.0)     (21.2) (21.9)                                   (50.0)     (21.2) (21.9)                          
Common Stock Dividends               (1.2)                                                           (3.2) (1.2)    
Other Changes in Equity (1.6)                           (2.6)                                             1.0      
Dividends Paid on Common Stock       (5.0)                                           (5.0)                              
Net Income (Loss) 520.8             58.8                             520.8             58.8                      
Net Income (Loss) Attributable to Noncontrolling Interests (6.3)             0.4                                                           (6.3) 0.4    
Net Income (Loss) 514.5 81.3 66.9 73.7 63.8 80.9 46.4 59.2                               81.3 66.9 73.7 63.8 80.9 46.4                        
Other Comprehensive Income (Loss) 43.6 (1.8) 0.3   0.4   (0.3) 0.0                                             43.6 (1.8) 0.3 0.4   (0.3)          
Ending Balance at Jun. 30, 2020       $ 4,381.0                           $ 2,665.6               $ 1,715.4                              
Ending Balance at Jun. 30, 2020 $ 20,278.2 $ 4,262.1 $ 3,076.2   $ 2,659.2 $ 2,621.0 $ 1,409.2 $ 2,516.1 $ 3,355.4 $ 260.4 $ 56.6 $ 321.2 $ 157.2 $ 135.7 $ 6,603.0 $ 1,828.7 $ 1,457.9   $ 980.9 $ 838.8 $ 364.0 $ 676.6 $ 10,221.9 $ 2,174.9 $ 1,630.5   $ 1,632.5 $ 1,461.0 $ 887.4 $ 1,705.0 $ (172.9) $ (1.9) $ (12.2) $ (10.8) $ 0.0 $ 0.6 $ (1.3) $ 270.8 $ 0.1    
Ending Balance, Shares at Jun. 30, 2020 516,214,732           10,482,000   516,200,000                                                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                  
Common Stock, Dividends Per Share, Declared $ 0.70                                                                                
[1] Cash dividends declared per AEP common share were $0.67.
[2] Includes $(62) million related to a forward equity purchase contract associated with the issuance of Equity Units.
[3] Cash dividends declared per AEP common share were $0.70.