v2.4.0.6
General Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from Continuing Operations $ 658 $ 305
Net Income (loss) attributable to KMI 292 21
Net Income (Loss) Attributable to Noncontrolling Interest 364 (94)
Less: income from continuing operations attributable to noncontrolling interests   144
Income from continuing operations attributable to KMI   161
Income from continuing operations attributable to shareholders   161
Dividends declared during the period   (220)
Remaining (excess) undistributed earnings   (59)
Remaining (excess) undistributed earnings   (199)
Net (loss) income attributable to shareholders   21
Class P [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from continuing operations attributable to shareholders   40
Dividends declared during the period   54
Remaining (excess) undistributed earnings   (14)
Remaining (excess) undistributed earnings   (48)
Net (loss) income attributable to shareholders   6
Basic weighted average number of shares outstanding (in shares) 1,036 171
Basic earnings per common share from continuing operations (in dollars per share) $ 0.28 $ 0.23
Income from continuing operations attributable to shareholders and assumed conversions   161
Basic earnings per common share (usd per share) $ 0.28 $ 0.03
Net income attributable to shareholders and assumed conversions(c)   21
Diluted weighted average number of shares (in shares) 1,038 708
Diluted loss per common share (usd per share)   $ 0.03
Diluted earnings per common share from continuing operations (in dollars per share)   $ 0.23
Common Class A [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from continuing operations attributable to shareholders   109
Dividends declared during the period   154
Remaining (excess) undistributed earnings   (45)
Remaining (excess) undistributed earnings   (151)
Net (loss) income attributable to shareholders   3
Basic weighted average number of shares outstanding (in shares)    536
Basic earnings per common share from continuing operations (in dollars per share)    $ 0.21
Income from continuing operations attributable to shareholders and assumed conversions   109
Basic earnings per common share (usd per share)    $ 0.01
Net income attributable to shareholders and assumed conversions(c)   3
Diluted weighted average number of shares (in shares)    536
Diluted loss per common share (usd per share)   $ 0.01
Diluted earnings per common share from continuing operations (in dollars per share)   $ 0.21
Participating Securities [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from continuing operations attributable to shareholders   12
Dividends declared during the period   12
Remaining (excess) undistributed earnings   0
Remaining (excess) undistributed earnings   0
Net (loss) income attributable to shareholders   $ 12