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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Units
General Partner
Partners' Capital Excluding Noncontrolling Interests
Noncontrolling Interests
Balance at Dec. 31, 2008 $ 3,552 $ 3,441 $ 111 $ 3,552 $ 0
Balance (in units) at Dec. 31, 2008   123,000,000      
Increase (Decrease) in Partners' Capital          
Net income 580 434 145 579 1
Sale of noncontrolling interest in a subsidiary (Note 5) 26 (37) (1) (38) 64
Distributions (607) (468) (137) (605) (2)
Issuance of common units 456 447 9 456  
Issuance of common units (in units) 11,040,000 11,000,000      
Issuance of common units in connection with the PNGS Acquisition 93 91 2 93  
Issuance of common units in connection with the PNGS Acquisition (in units)   2,000,000      
Issuance of common units under LTIP 12 12   12  
Equity compensation expense (Note 10) 5 2 3 5  
Other comprehensive income (loss) 48 46 2 48  
Other (6) (3) (3) (6)  
Balance at Dec. 31, 2009 4,159 3,965 131 4,096 63
Balance (in units) at Dec. 31, 2009   136,000,000      
Increase (Decrease) in Partners' Capital          
Net income 514 330 175 505 9
Sale of noncontrolling interest in a subsidiary (Note 5) 268 99 2 101 167
Distributions (692) (512) (170) (682) (10)
Issuance of common units 296 290 6 296  
Issuance of common units (in units) 4,780,000 5,000,000      
Issuance of common units under LTIP 16 16   16  
Equity compensation expense (Note 10) 16 4 9 13 3
Other comprehensive income (loss) (5) (5)   (5)  
Other 1 2   2 (1)
Balance at Dec. 31, 2010 4,573 4,189 153 4,342 231
Balance (in units) at Dec. 31, 2010 141,199,175 141,000,000      
Increase (Decrease) in Partners' Capital          
Net income 994 730 236 966 28
Sale of noncontrolling interest in a subsidiary (Note 5) 370 63 1 64 306
Distributions (831) (575) (216) (791) (40)
Issuance of common units 889 870 19 889  
Issuance of common units (in units) 13,935,000 14,000,000      
Issuance of common units under LTIP 15 15   15  
Equity compensation expense (Note 10) 28 16 9 25 3
Other comprehensive income (loss) (64) (59) (1) (60) (4)
Balance at Dec. 31, 2011 $ 5,974 $ 5,249 $ 201 $ 5,450 $ 524
Balance (in units) at Dec. 31, 2011 155,376,937 155,000,000