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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
BASIC EARNINGS PER SHARE                      
Income (loss) from continuing operations attributable to The AES Corporation common stockholders (Income)                 $ (915) $ 492 $ 496
Income (loss) from continuing operations attributable to The AES Corporation common stockholders (Shares)                 755,000,000 778,000,000 769,000,000
Income (loss) from continuing operations attributable to The AES Corporation common stockholders, net of tax $ 0.31 $ (2.10) $ 0.09 $ 0.46 $ 0.18 $ (0.08) $ 0.24 $ 0.29 $ (1.21) $ 0.63 $ 0.64
EFFECT OF DILUTIVE SECURITIES                      
Stock options (Shares)                 0 2,000,000 2,000,000
Restricted stock units (Shares)                 0 3,000,000 3,000,000
Restricted stock units (Per Share)                 $ 0 $ 0 $ 0
DILUTED EARNINGS PER SHARE (INCOME)                 $ (915) $ 492 $ 496
DILUTED EARNINGS PER SHARE (SHARES)                 755,000,000 783,000,000 774,000,000
Diluted Earnings Per Share $ 0.31 $ (2.10) $ 0.09 $ 0.45 $ 0.18 $ (0.08) $ 0.24 $ 0.29 $ (1.21) $ 0.63 $ 0.64
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Shares of common stock issued upon exercise of stock options                 2,000,000    
Shares of common stock issued under the Company's profit sharing plan                 1,000,000    
Exercise price exceeds market price [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Additional options outstanding that could potentially dilute EPS in the future                 7,000,000 7,000,000 17,000,000
Restricted Stock Units (RSUs) [Member] | Anti-dilutive; Lack of generated income [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Additional options outstanding that could potentially dilute EPS in the future                 4,000,000