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Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Appalachian Power 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]
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]
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]
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]
Beginning Balance at Dec. 31, 2014 $ 16,824.5 $ 3,366.9 $ 1,954.0 $ 1,980.2 $ 1,028.2 $ 2,097.2 $ 3,313.3 $ 260.4 $ 56.6 $ 321.2 $ 157.2 $ 135.7 $ 6,203.4 $ 1,809.6 $ 980.9 $ 838.8 $ 364.0 $ 674.6 $ 7,406.6 $ 1,291.9 $ 930.8 $ 814.6 $ 502.0 $ 1,294.0 $ (103.1) $ 5.0 $ (14.3) $ 5.6 $ 5.0 $ (7.5) $ 4.3 $ 0.4
Beginning Balance, Shares at Dec. 31, 2014             509,700,000                                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                
Issuance of Common Stock, Value 67.9           $ 9.1           58.8                                      
Issuance of Common Stock, Shares             1,400,000                                                  
Common Stock Dividends (783.4)                                   (780.3)                          
Common Stock Dividends   (181.3) (90.0) (156.3)   (90.0)                           (181.3) (90.0) (156.3)   (90.0)                
Common Stock Dividends           (3.1)                                                 (3.1) (3.1)
Other Changes in Equity 24.6                       19.6                                   5.0  
Net Income (Loss) 1,577.5         185.3                         1,577.5         185.3                
Net Income Attributable to Noncontrolling Interests 4.1         3.0                                                 4.1 3.0
Net Income (Loss) 1,581.6 275.4 179.9 184.7 85.5 188.3                           275.4 179.9 184.7 85.5                  
Other Comprehensive Income (Loss) (10.8) (1.5) 0.8 (1.0) (0.5) 0.8                                     (10.8) (1.5) 0.8 (1.0) (0.5) 0.8    
Contribution of Mutual Energy SWEPCo, LLC from Parent           2.0                       2.0                            
Pension and OPEB Adjustment Related to Mitchell Plant 5.1                                               5.1              
Ending Balance at Sep. 30, 2015 17,709.5 3,459.5 2,044.7 2,007.6 1,113.2 2,195.2 $ 3,322.4 260.4 56.6 321.2 157.2 135.7 6,281.8 1,809.6 980.9 838.8 364.0 676.6 8,203.8 1,386.0 1,020.7 843.0 587.5 1,389.3 (108.8) 3.5 (13.5) 4.6 4.5 (6.7) 10.3 0.3
Ending Balance, Shares at Sep. 30, 2015             511,100,000                                                  
Beginning Balance at Dec. 31, 2015 $ 17,904.9 3,475.0 2,036.4 1,986.6 $ 1,119.9 2,169.7 $ 3,324.0 260.4 56.6 321.2 157.2 135.7 6,296.5 1,828.7 980.9 838.8 364.0 676.6 8,398.3 1,388.7 1,015.6 822.3 594.5 1,366.3 (127.1) (2.8) (16.7) 4.3 4.2 (9.4) 13.2 0.5
Beginning Balance, Shares at Dec. 31, 2015 511,389,173       10,482,000   511,400,000                                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                
Issuance of Common Stock, Value $ 34.2           $ 4.3           29.9                                      
Issuance of Common Stock, Shares             600,000                                                  
Common Stock Dividends (829.8)                                   (826.4)                          
Common Stock Dividends   (225.0) (93.8) (150.0)   (90.0)                           (225.0) (93.8) (150.0)   (90.0)                
Common Stock Dividends           (3.5)                                                 (3.4) (3.5)
Other Changes in Equity 9.6                       3.6                                   6.0  
Net Income (Loss) 237.5         149.9                         237.5         149.9                
Net Income Attributable to Noncontrolling Interests 5.3         3.3                                                 5.3 3.3
Net Income (Loss) 242.8 303.8 201.4 244.7 $ 97.4 153.2                           303.8 201.4 244.7 97.4                  
Other Comprehensive Income (Loss) (18.7) (1.6) 1.0 (1.0) (0.6) 0.8                                     (18.7) (1.6) 1.0 (1.0) (0.6) 0.8    
Contribution of Mutual Energy SWEPCo, LLC from Parent           0.0                                                    
Ending Balance at Sep. 30, 2016 $ 17,343.0 $ 3,552.2 $ 2,145.0 $ 2,080.3 $ 1,216.7 $ 2,230.2 $ 3,328.3 $ 260.4 $ 56.6 $ 321.2 $ 157.2 $ 135.7 $ 6,330.0 $ 1,828.7 $ 980.9 $ 838.8 $ 364.0 $ 676.6 $ 7,809.4 $ 1,467.5 $ 1,123.2 $ 917.0 $ 691.9 $ 1,426.2 $ (145.8) $ (4.4) $ (15.7) $ 3.3 $ 3.6 $ (8.6) $ 21.1 $ 0.3
Ending Balance, Shares at Sep. 30, 2016 512,046,044       10,482,000   512,000,000