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Condensed Consolidated Statements of Changes in Equity - USD ($)
Total
Vertically Integrated Utilities [Member]
Transmission and Distribution Utilities [Member]
Generation and Marketing Revenues [Member]
Other Revenues [Member]
Reconciling Adjustments [Member]
Reconciling Adjustments [Member]
Other Revenues [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
Generation and Marketing Revenues [Member]
Generation And Marketing [Member]
Other Revenues [Member]
Other Segments [Member]
[2]
Other Segments [Member]
Other Revenues [Member]
Transmission Operations [Member]
Transmission Operations [Member]
Transmission [Member]
Transmission And Distribution Utilities [Member]
Transmission And Distribution Utilities [Member]
Transmission and Distribution Utilities [Member]
Transmission And Distribution Utilities [Member]
Other Revenues [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Other Revenues [Member]
Appalachian Power Co [Member]
Appalachian Power Co [Member]
Vertically Integrated Utilities [Member]
Appalachian Power Co [Member]
Other Revenues [Member]
AEP Texas Inc. [Member]
AEP Texas Inc. [Member]
Transmission and Distribution Utilities [Member]
AEP Texas Inc. [Member]
Other Revenues [Member]
AEP Transmission Co [Member]
AEP Transmission Co [Member]
Transmission [Member]
AEP Transmission Co [Member]
Other Revenues [Member]
AEP Transmission Co [Member]
Reconciling Adjustments [Member]
AEP Transmission Co [Member]
Reconciling Adjustments [Member]
Other Revenues [Member]
AEP Transmission Co [Member]
State Transcos [Member]
AEP Transmission Co [Member]
State Transcos [Member]
Transmission [Member]
AEP Transmission Co [Member]
State Transcos [Member]
Other Revenues [Member]
AEP Transmission Co [Member]
AEPTCo Parent [Member]
AEP Transmission Co [Member]
AEPTCo Parent [Member]
Other Revenues [Member]
Indiana Michigan Power Co [Member]
Indiana Michigan Power Co [Member]
Vertically Integrated Utilities [Member]
Indiana Michigan Power Co [Member]
Other Revenues [Member]
Ohio Power Co [Member]
Ohio Power Co [Member]
Transmission and Distribution Utilities [Member]
Ohio Power Co [Member]
Other Revenues [Member]
Public Service Co Of Oklahoma [Member]
Public Service Co Of Oklahoma [Member]
Vertically Integrated Utilities [Member]
Public Service Co Of Oklahoma [Member]
Other Revenues [Member]
Southwestern Electric Power Co [Member]
Southwestern Electric Power Co [Member]
Vertically Integrated Utilities [Member]
Southwestern Electric Power Co [Member]
Other Revenues [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 (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Appalachian Power Co [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
AEP Texas Inc. [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Indiana Michigan Power Co [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Public Service Co Of Oklahoma [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Southwestern Electric Power Co [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Southwestern Electric Power Co [Member]
Beginning Balance at Dec. 31, 2022                                                     $ 5,873,000,000                                                             $ 3,022,300,000               $ 2,850,700,000                        
Beginning Balance at Dec. 31, 2022 $ 24,122,400,000                                       $ 4,975,400,000     $ 3,904,300,000                         $ 3,008,300,000     $ 3,088,100,000     $ 2,419,100,000     $ 3,674,800,000     $ 3,413,100,000 $ 260,400,000 $ 56,600,000 $ 321,200,000 $ 157,200,000 $ 100,000 $ 8,051,000,000 $ 1,828,700,000 $ 1,558,200,000   $ 988,800,000 $ 837,800,000 $ 1,042,600,000 $ 1,442,200,000 $ 12,345,600,000 $ 2,891,100,000 $ 2,354,700,000   $ 1,963,200,000 $ 1,929,100,000 $ 1,218,000,000 $ 2,236,000,000 $ 83,700,000 $ (4,800,000) $ (8,600,000) $ (300,000) $ 1,300,000 $ (4,200,000) $ 229,000,000.0 $ 700,000
Beginning Balance, Shares at Dec. 31, 2022                                                                                                 525,100,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Issuance of Common Stock, Value 41,100,000                                                                                               $ 5,100,000           36,000,000.0                                              
Issuance of Common Stock, Shares                                                                                                 800,000                                                          
Common Stock Dividends (431,800,000)                                                                                                                           (428,800,000) [1]                              
Common Stock Dividends                                                                         (31,200,000)           (17,500,000)                                               (31,200,000)   (17,500,000)                  
Common Stock Dividends                                                                                           (1,500,000)                                                             (3,000,000.0) (1,500,000)
Other Changes in Equity (12,500,000)                                                                                                           (12,700,000)               0                           200,000  
Capital Contribution from Parent/Member                                               100,000,000.0     25,000,000.0                         50,000,000.0           50,000,000.0                     100,000,000.0 25,000,000.0   50,000,000.0   50,000,000.0                                
Dividends Paid on Common Stock                                                     (55,000,000.0)                                                                             (55,000,000.0)                        
Net Income (Loss)                                                                                                                             397,000,000.0             40,600,000                
Net Income (Loss) Attributable to Noncontrolling Interests                                                                                                                                                         3,400,000 1,200,000
Net Income (Loss) 400,400,000                                       112,500,000     47,600,000     162,700,000                   102,800,000     78,000,000.0     (2,300,000)     41,800,000                                   112,500,000 47,600,000 162,700,000 102,800,000 78,000,000.0 (2,300,000)                  
Other Comprehensive Income (Loss) (151,800,000)                                       (1,000,000.0)     (600,000)                         (2,600,000)           (1,500,000)     100,000                                                 (151,800,000) (1,000,000.0) (600,000) (2,600,000) (1,500,000) 100,000    
Ending Balance at Mar. 31, 2023                                                     6,005,700,000                                                             3,047,300,000               2,958,400,000                        
Ending Balance at Mar. 31, 2023 $ 23,967,800,000                                       5,086,900,000     4,051,300,000                         3,077,300,000     3,216,100,000     2,397,800,000     3,765,200,000     $ 3,418,200,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 8,074,300,000 1,828,700,000 1,658,200,000   988,800,000 887,800,000 1,042,600,000 1,492,200,000 12,313,800,000 3,003,600,000 2,402,300,000   2,034,800,000 2,007,100,000 1,198,200,000 2,276,600,000 (68,100,000) (5,800,000) (9,200,000) (2,900,000) (200,000) (4,100,000) 229,600,000 400,000
Ending Balance, Shares at Mar. 31, 2023                                                                                                 525,900,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Common Stock, Dividends Per Share, Declared $ 0.83                                                                                                                                                          
Beginning Balance at Dec. 31, 2022                                                     5,873,000,000                                                             3,022,300,000               2,850,700,000                        
Beginning Balance at Dec. 31, 2022 $ 24,122,400,000                                       4,975,400,000     3,904,300,000                         3,008,300,000     3,088,100,000     2,419,100,000     3,674,800,000     $ 3,413,100,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 8,051,000,000 1,828,700,000 1,558,200,000   988,800,000 837,800,000 1,042,600,000 1,442,200,000 12,345,600,000 2,891,100,000 2,354,700,000   1,963,200,000 1,929,100,000 1,218,000,000 2,236,000,000 83,700,000 (4,800,000) (8,600,000) (300,000) 1,300,000 (4,200,000) 229,000,000.0 700,000
Beginning Balance, Shares at Dec. 31, 2022                                                                                                 525,100,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Capital Contributions from Parent                                         4,300,000     275,300,000     25,000,000.0                   100,000     175,000,000.0     0     50,000,000.0                                                                
Dividends Paid on Common Stock                                                     (85,000,000.0)                   (62,500,000)           (17,500,000)     (50,000,000.0)                                                                
Net Income (Loss) 918,200,000                                                                                         121,600,000                                                                
Net Income (Loss) Attributable to Noncontrolling Interests (1,700,000)                                                                                         1,500,000                                                                
Net Income (Loss) 916,500,000         $ 0   $ (195,000,000.0)     $ (111,200,000)   $ 379,700,000   $ 302,400,000     $ 540,600,000     155,400,000     156,700,000     338,400,000     $ 0   $ 335,800,000     $ 2,600,000 [3]   177,600,000     145,700,000     48,700,000     123,100,000                                                                
Other Comprehensive Income (Loss) (120,100,000)                                       (2,000,000.0)     2,600,000                         (2,800,000)                 (300,000)                                                                
Ending Balance at Jun. 30, 2023                                                     6,142,800,000                                                             3,038,700,000               3,104,100,000                        
Ending Balance at Jun. 30, 2023 24,123,600,000                                       5,133,100,000     4,334,600,000                         3,120,700,000     3,408,800,000     2,446,300,000     3,795,500,000     $ 3,421,500,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 8,110,800,000 1,833,000,000 1,829,200,000   988,900,000 1,012,800,000 1,040,100,000 1,492,200,000 12,405,500,000 3,046,500,000 2,511,400,000   2,078,300,000 2,074,800,000 1,249,200,000 2,307,600,000 (36,400,000) (6,800,000) (6,000,000.0) (3,100,000) (200,000) (4,500,000) 222,200,000 100,000
Ending Balance, Shares at Jun. 30, 2023                                                                                                 526,400,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Revenue from Contracts with Customers 9,063,400,000 $ 5,445,300,000 $ 2,786,100,000 $ 645,100,000 $ 186,900,000 0     $ 645,100,000     $ 8,500,000 [2]   $ 178,400,000   $ 2,786,100,000     $ 5,445,300,000     $ 1,677,000,000 $ 6,500,000   $ 887,100,000 $ 1,100,000   $ 180,200,000 $ 0 0     $ 176,400,000   0     $ 1,223,200,000 $ 5,500,000   $ 1,890,600,000 $ 7,300,000   $ 887,200,000 $ 3,700,000   $ 1,025,200,000 $ 1,300,000                                                            
Revenues 9,063,400,000       (258,700,000) [4],[5] (907,900,000) $ (2,900,000) [4],[5] 658,400,000   $ (276,200,000) [4],[5] 62,100,000 3,200,000 [4],[5] 914,100,000   2,804,400,000   $ 17,200,000 [4],[5] 5,532,300,000   $ 0 [4],[5] 1,814,200,000   0 [6] 890,700,000   0 [6] 886,500,000   0 [6] 0   886,500,000     0   1,262,200,000   0 [6] 1,913,700,000   17,100,000 [6] 891,700,000   0 [6] 1,053,700,000   0 [6]                                                            
Revenues from Related Parties, Net of Provisions for Refund                                                     710,100,000                                                                                                      
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax                                                       176,400,000                                                                                                    
Beginning Balance at Mar. 31, 2023                                                     6,005,700,000                                                             3,047,300,000               2,958,400,000                        
Beginning Balance at Mar. 31, 2023 23,967,800,000                                       5,086,900,000     4,051,300,000                         3,077,300,000     3,216,100,000     2,397,800,000     3,765,200,000     $ 3,418,200,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 8,074,300,000 1,828,700,000 1,658,200,000   988,800,000 887,800,000 1,042,600,000 1,492,200,000 12,313,800,000 3,003,600,000 2,402,300,000   2,034,800,000 2,007,100,000 1,198,200,000 2,276,600,000 (68,100,000) (5,800,000) (9,200,000) (2,900,000) (200,000) (4,100,000) 229,600,000 400,000
Beginning Balance, Shares at Mar. 31, 2023                                                                                                 525,900,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Issuance of Common Stock, Value 36,500,000                                                                                               $ 3,300,000           33,200,000                                              
Issuance of Common Stock, Shares                                                                                                 500,000                                                          
Common Stock Dividends (431,800,000)                                                                                                                           (429,500,000) [1]                              
Common Stock Dividends                                                                         (31,300,000)                 (50,000,000.0)                                         (31,300,000)     (50,000,000.0)                
Common Stock Dividends                                                                                           (600,000)                                                             (2,300,000) (600,000)
Other Changes in Equity 3,300,000                                                                                                           3,300,000                                              
Capital Contribution from Parent/Member                                               175,300,000                         100,000     125,000,000.0                                 175,300,000   100,000 125,000,000.0                                    
Capital Contributions from Parent                                         4,300,000                                                                     4,300,000                                            
Return of Capital to Parent                                               (4,300,000)     (8,600,000)                               (2,500,000)                           (4,300,000) (8,600,000)     (2,500,000)                                  
Dividends Paid on Common Stock                                                     (30,000,000.0)                                                                             (30,000,000.0)                        
Net Income (Loss) 521,200,000                                                                                         81,000,000.0                                 521,200,000             81,000,000.0                
Net Income (Loss) Attributable to Noncontrolling Interests (5,100,000)                                                                                         300,000                                                             (5,100,000) 300,000
Net Income (Loss) 516,100,000         0   (38,600,000)     (97,700,000)   197,300,000   176,700,000     278,400,000     42,900,000     109,100,000     175,700,000     0   174,200,000     1,500,000 [3]   74,800,000     67,700,000     51,000,000.0     81,300,000                                   42,900,000 109,100,000 175,700,000 74,800,000 67,700,000 51,000,000.0                  
Other Comprehensive Income (Loss) 31,700,000                                       (1,000,000.0)     3,200,000                         (200,000)                 (400,000)                                                 31,700,000 (1,000,000.0) 3,200,000 (200,000)   (400,000)    
Ending Balance at Jun. 30, 2023                                                     6,142,800,000                                                             3,038,700,000               3,104,100,000                        
Ending Balance at Jun. 30, 2023 $ 24,123,600,000                                       5,133,100,000     4,334,600,000                         3,120,700,000     3,408,800,000     2,446,300,000     3,795,500,000     $ 3,421,500,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 8,110,800,000 1,833,000,000 1,829,200,000   988,900,000 1,012,800,000 1,040,100,000 1,492,200,000 12,405,500,000 3,046,500,000 2,511,400,000   2,078,300,000 2,074,800,000 1,249,200,000 2,307,600,000 (36,400,000) (6,800,000) (6,000,000.0) (3,100,000) (200,000) (4,500,000) 222,200,000 100,000
Ending Balance, Shares at Jun. 30, 2023                                                                                                 526,400,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Common Stock, Dividends Per Share, Declared $ 0.83                                                                                                                                                          
Revenue from Contracts with Customers $ 4,372,500,000 2,629,000,000 1,330,800,000 318,200,000 94,500,000 0     318,200,000     6,200,000 [2]   88,300,000   1,330,800,000     2,629,000,000     762,500,000 2,900,000   459,400,000 500,000   90,200,000 0 0     87,400,000   0     580,400,000 2,400,000   868,800,000 2,100,000   472,400,000 2,200,000   525,800,000 800,000                                                            
Revenues 4,372,500,000       (128,800,000) [7],[8] (464,200,000) (2,000,000.0) [7],[8] 331,400,000   (135,200,000) [7],[8] 32,000,000.0 2,200,000 [7],[8] 458,600,000   1,340,200,000   6,100,000 [7],[8] 2,674,500,000   100,000 [7],[8] 826,500,000   0 [9] 461,200,000   0 [9] 444,900,000   0 [9] 0   444,900,000     0   599,200,000   0 [9] 879,100,000   6,000,000.0 [9] 474,700,000   0 [9] 537,800,000   0 [9]                                                            
Revenues from Related Parties, Net of Provisions for Refund                                                     357,500,000                                                                                                      
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax                                                       87,400,000                                                                                                    
Beginning Balance at Dec. 31, 2023                                                     6,333,300,000                                                             3,043,400,000               3,289,900,000                        
Beginning Balance at Dec. 31, 2023 $ 25,285,900,000                                       5,276,700,000     4,796,100,000                         3,140,200,000     3,571,300,000     $ 2,570,600,000     3,770,400,000     $ 3,427,900,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 9,073,900,000 1,834,500,000 2,079,600,000   997,600,000 1,012,800,000 1,039,300,000 1,492,200,000 12,800,400,000 3,185,500,000 2,725,100,000   2,086,600,000 2,237,300,000 1,374,300,000 2,281,300,000 (55,500,000) (3,700,000) (8,600,000) (600,000) (200,000) (3,400,000) 39,200,000 200,000
Beginning Balance, Shares at Dec. 31, 2023 527,369,157                                                                                   10,482,000           527,400,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Issuance of Common Stock, Value $ 40,600,000                                                                                               $ 5,400,000           35,200,000                                              
Issuance of Common Stock, Shares                                                                                                 800,000                                                          
Common Stock Dividends (466,900,000)                                                                                                                           (465,500,000) [10]                              
Common Stock Dividends                                                                         (37,500,000)           $ (35,000,000.0)     (50,000,000.0)                                         (37,500,000)   (35,000,000.0) (50,000,000.0)                
Common Stock Dividends                                                                                           (1,400,000)                                                             (1,400,000) (1,400,000)
Other Changes in Equity (14,800,000)                                                                                                           (14,800,000)                                              
Capital Contribution from Parent/Member                                                     25,000,000.0                                                             25,000,000.0                                        
Capital Contributions from Parent                                         100,000,000.0                                                                     100,000,000.0                                            
Dividends Paid on Common Stock                                                     (40,000,000.0)                                                                             (40,000,000.0)                        
Net Income (Loss)                                                                                                                             1,003,100,000             208,100,000                
Net Income (Loss) Attributable to Noncontrolling Interests                                                                                                                                                         2,600,000 1,500,000
Net Income (Loss) 1,005,700,000                                       136,500,000     79,700,000     181,200,000                   145,000,000.0     70,600,000     72,000,000.0     209,600,000                                   136,500,000 79,700,000 181,200,000 145,000,000.0 70,600,000 72,000,000.0                  
Other Comprehensive Income (Loss) (6,800,000)                                       (500,000)     3,900,000                         100,000                 (200,000)                                                 (6,800,000) (500,000) 3,900,000 100,000   (200,000)    
Ending Balance at Mar. 31, 2024                                                     6,499,500,000                                                             3,068,400,000               3,431,100,000                        
Ending Balance at Mar. 31, 2024 $ 25,843,700,000                                       5,512,700,000     4,879,700,000                         3,247,800,000     3,641,900,000     2,607,600,000     3,928,400,000     $ 3,433,300,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 9,094,300,000 1,934,500,000 2,079,600,000   997,600,000 1,012,800,000 1,039,300,000 1,492,200,000 13,338,000,000 3,322,000,000 2,804,800,000   2,194,100,000 2,307,900,000 1,411,300,000 2,439,400,000 (62,300,000) (4,200,000) (4,700,000) (500,000) (200,000) (3,600,000) 40,400,000 300,000
Ending Balance, Shares at Mar. 31, 2024                                                                                                 528,200,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Common Stock, Dividends Per Share, Declared $ 0.88                                                                                                                                                          
Beginning Balance at Dec. 31, 2023                                                     6,333,300,000                                                             3,043,400,000               3,289,900,000                        
Beginning Balance at Dec. 31, 2023 $ 25,285,900,000                                       5,276,700,000     4,796,100,000                         3,140,200,000     3,571,300,000     $ 2,570,600,000     3,770,400,000     $ 3,427,900,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 9,073,900,000 1,834,500,000 2,079,600,000   997,600,000 1,012,800,000 1,039,300,000 1,492,200,000 12,800,400,000 3,185,500,000 2,725,100,000   2,086,600,000 2,237,300,000 1,374,300,000 2,281,300,000 (55,500,000) (3,700,000) (8,600,000) (600,000) (200,000) (3,400,000) 39,200,000 200,000
Beginning Balance, Shares at Dec. 31, 2023 527,369,157                                                                                   10,482,000           527,400,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Issuance of Common Stock, Shares 4,437,136                                                                                                                                                          
Capital Contributions from Parent                                         109,500,000     1,600,000     34,600,000                   5,000,000.0     0     $ 200,000     0                                                                
Dividends Paid on Common Stock                                                     (71,000,000.0)                   (75,000,000.0)           (70,000,000.0)     (150,000,000.0)                                                                
Net Income (Loss) $ 1,343,400,000                                                                                         138,000,000.0                                                                
Net Income (Loss) Attributable to Noncontrolling Interests 4,800,000                                                                                         2,500,000                                                                
Net Income (Loss) 1,348,200,000         0   132,800,000     (122,400,000)   411,700,000   297,100,000     629,000,000.0     194,800,000     208,100,000     356,900,000     0   356,900,000     0 [3]   180,200,000     89,000,000.0     108,300,000     140,500,000                                                                
Other Comprehensive Income (Loss) 15,500,000                                       (1,000,000.0)     6,100,000                         100,000                 (200,000)                                                                
Ending Balance at Jun. 30, 2024                                                     6,653,800,000                                                             3,078,000,000               3,575,800,000                        
Ending Balance at Jun. 30, 2024 $ 26,175,700,000                                       5,580,000,000     5,011,900,000                         3,250,500,000     3,660,300,000     $ 2,609,100,000     3,758,300,000     $ 3,465,400,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 9,498,500,000 1,944,000,000 2,081,200,000   1,002,600,000 1,012,800,000 1,039,500,000 1,492,200,000 13,211,300,000 3,380,300,000 2,933,200,000   2,191,800,000 2,326,300,000 1,412,600,000 2,269,300,000 (40,000,000.0) (4,700,000) (2,500,000) (500,000) (200,000) (3,600,000) 40,500,000 300,000
Ending Balance, Shares at Jun. 30, 2024 533,144,747                                                                                   10,482,000           533,100,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Revenue from Contracts with Customers $ 9,604,900,000 5,473,200,000 2,912,000,000 958,400,000 261,300,000 0     958,400,000     42,100,000 [2]   219,200,000   2,912,000,000     5,473,200,000     1,876,000,000 9,300,000   1,000,700,000 2,600,000   195,700,000 2,800,000 0 $ 0   194,000,000.0 $ 2,800,000 0 $ 0   1,217,400,000 4,900,000   1,903,200,000 5,500,000   826,200,000 15,800,000   1,055,400,000 6,300,000                                                            
Revenues 9,604,900,000       (103,600,000) [11],[12] (1,016,800,000) 5,600,000 [11],[12] 1,031,000,000   (93,800,000) [11],[12] 110,500,000 (5,900,000) [11],[12] 987,200,000   2,926,100,000   11,900,000 [11],[12] 5,566,900,000   (21,400,000) [11],[12] 2,003,200,000   100,000 [13] 1,006,000,000   0 [13] 958,000,000.0   0 [13] 0   958,000,000.0     0   1,261,700,000   (21,500,000) [13] 1,920,100,000   11,900,000 [13] $ 846,600,000   0 [13] 912,000,000.0   0 [13]                                                            
Revenues from Related Parties, Net of Provisions for Refund                                                     761,200,000                                                                                                      
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax                                                       194,000,000.0 2,800,000                                                                                                  
Beginning Balance at Mar. 31, 2024                                                     6,499,500,000                                                             3,068,400,000               3,431,100,000                        
Beginning Balance at Mar. 31, 2024 25,843,700,000                                       5,512,700,000     4,879,700,000                         3,247,800,000     3,641,900,000     2,607,600,000     3,928,400,000     $ 3,433,300,000 260,400,000 56,600,000 321,200,000 157,200,000 100,000 9,094,300,000 1,934,500,000 2,079,600,000   997,600,000 1,012,800,000 1,039,300,000 1,492,200,000 13,338,000,000 3,322,000,000 2,804,800,000   2,194,100,000 2,307,900,000 1,411,300,000 2,439,400,000 (62,300,000) (4,200,000) (4,700,000) (500,000) (200,000) (3,600,000) 40,400,000 300,000
Beginning Balance, Shares at Mar. 31, 2024                                                                                                 528,200,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Issuance of Common Stock, Value 435,200,000                                                                                               $ 32,100,000           403,100,000                                              
Issuance of Common Stock, Shares                                                                                                 4,900,000                                                          
Common Stock Dividends (469,100,000)                                                                                                                           (467,000,000.0) [10]                              
Common Stock Dividends                                                                         (37,500,000)           (35,000,000.0)     (100,000,000.0)                                         (37,500,000)   (35,000,000.0) (100,000,000.0)                
Common Stock Dividends                                                                                           (1,000,000.0)                                                             (2,100,000) (1,000,000.0)
Other Changes in Equity 1,100,000                                                                                                           1,100,000                                              
Capital Contribution from Parent/Member                                               1,600,000     9,600,000                   5,000,000.0           200,000                           1,600,000 9,600,000 5,000,000.0   200,000                                  
Capital Contributions from Parent                                         9,500,000                                                                     9,500,000                                            
Dividends Paid on Common Stock                                                     (31,000,000.0)                                                                             (31,000,000.0)                        
Net Income (Loss) 340,300,000                                                                                         (70,100,000)                                 340,300,000             (70,100,000)                
Net Income (Loss) Attributable to Noncontrolling Interests 2,200,000                                                                                         1,000,000.0                                                             2,200,000 1,000,000.0
Net Income (Loss) 342,500,000         0   (4,800,000)     (68,100,000)   201,900,000   146,800,000     66,700,000     58,300,000     128,400,000     175,700,000     0   175,200,000     500,000 [3]   35,200,000     18,400,000     36,300,000     (69,100,000)                                   58,300,000 128,400,000 175,700,000 35,200,000 18,400,000 36,300,000                  
Other Comprehensive Income (Loss) 22,300,000                                       (500,000)     2,200,000                         0                 0                                                 22,300,000 (500,000) 2,200,000          
Ending Balance at Jun. 30, 2024                                                     6,653,800,000                                                             $ 3,078,000,000               $ 3,575,800,000                        
Ending Balance at Jun. 30, 2024 $ 26,175,700,000                                       5,580,000,000     5,011,900,000                         3,250,500,000     3,660,300,000     $ 2,609,100,000     3,758,300,000     $ 3,465,400,000 $ 260,400,000 $ 56,600,000 $ 321,200,000 $ 157,200,000 $ 100,000 $ 9,498,500,000 $ 1,944,000,000 $ 2,081,200,000   $ 1,002,600,000 $ 1,012,800,000 $ 1,039,500,000 $ 1,492,200,000 $ 13,211,300,000 $ 3,380,300,000 $ 2,933,200,000   $ 2,191,800,000 $ 2,326,300,000 $ 1,412,600,000 $ 2,269,300,000 $ (40,000,000.0) $ (4,700,000) $ (2,500,000) $ (500,000) $ (200,000) $ (3,600,000) $ 40,500,000 $ 300,000
Ending Balance, Shares at Jun. 30, 2024 533,144,747                                                                                   10,482,000           533,100,000                                                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                                                                                            
Common Stock, Dividends Per Share, Declared $ 0.88                                                                                                                                                          
Revenue from Contracts with Customers $ 4,579,200,000 $ 2,572,000,000 $ 1,428,800,000 $ 442,500,000 135,900,000 0     $ 442,500,000     27,200,000 [2]   $ 108,700,000   $ 1,428,800,000     $ 2,572,000,000     $ 851,700,000 3,700,000   $ 537,700,000 500,000   97,300,000 400,000 0 $ 0   $ 97,000,000.0 $ 400,000 0 $ 0   $ 569,600,000 2,100,000   $ 887,800,000 2,800,000   $ 448,100,000 9,600,000   $ 546,100,000 2,400,000                                                            
Revenues $ 4,579,200,000       $ (42,800,000) [14],[15] $ (490,800,000) $ (2,400,000) [14],[15] $ 467,500,000   $ (50,900,000) [14],[15] $ 57,700,000 $ 2,200,000 [14],[15] $ 489,900,000   $ 1,435,900,000   $ 4,000,000.0 [14],[15] $ 2,619,000,000   $ 4,300,000 [14],[15] $ 910,200,000   $ 0 [16] $ 539,600,000   $ 0 [16] 475,200,000   0 [16] $ 0   $ 475,200,000     $ 0   $ 594,300,000   $ 4,400,000 [16] $ 896,300,000   $ 4,000,000.0 [16] $ 458,800,000   $ 0 [16] $ 395,800,000   $ 0 [16]                                                            
Revenues from Related Parties, Net of Provisions for Refund                                                     $ 377,800,000                                                                                                      
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax                                                       $ 97,000,000.0 $ 400,000                                                                                                  
[1] Cash dividends declared per AEP common share were $0.83.
[2] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.
[3] Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.
[4] Generation & Marketing includes economic hedge activity.
[5] Amounts include affiliated and nonaffiliated revenues
[6] Amounts include affiliated and nonaffiliated revenues.
[7] Generation & Marketing includes economic hedge activity.
[8] Amounts include affiliated and nonaffiliated revenues
[9] Amounts include affiliated and nonaffiliated revenues.
[10] Cash dividends declared per AEP common share were $0.88.
[11] Amounts include affiliated and nonaffiliated revenues.
[12] Generation & Marketing includes economic hedge activity.
[13] Amounts include affiliated and nonaffiliated revenues.
[14] Amounts include affiliated and nonaffiliated revenues.
[15] Generation & Marketing includes economic hedge activity.
[16] Amounts include affiliated and nonaffiliated revenues.