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Consolidated Statement of Changes in Equity (Unaudited) (USD $)
In Millions, except Share data, unless otherwise specified
Total
General partner [Member]
Limited partners [Member]
Treasury Stock [Member]
Parent [Member]
Noncontrolling Interest [Member]
Equity at Dec. 31, 2011 $ 7,833 $ (271) $ 4,038 $ (12) $ 3,755 $ 4,078
Treasury units at Dec. 31, 2011 1,137,200     1,137,200    
Increase (Decrease) in Partners' Capital [Roll Forward]            
Net income 551 6 283 0 289 262
Other comprehensive income (3) 0 (1) 0 (1) (2)
Cancellation of treasury units 0 0 (12) 12 0 0
Cancellation of treasury units (in units)       (1,137,200)    
Partnership contributions 510 10 500 0 510 0
Partnership distributions (20) 0 (20) 0 (20) 0
Investment segment distributions (79) 0 0 0 0 (79)
Acquisition of CVR 910 0 0 0 0 910
Changes in subsidiary equity and other 0 0 2 0 2 (2)
Equity at Jun. 30, 2012 $ 9,702 $ (255) $ 4,790 $ 0 $ 4,535 $ 5,167
Treasury units at Jun. 30, 2012 0     0