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Schedule I - Condensed Financial Information of Parent Condensed Financial Information of Parent Company, Statement of Operations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net gain from investment activities $ 278 $ 590 $ 336 $ 1,207 $ 1,905 $ 814 $ 1,406
Interest and dividend income 17 27 42 61 117 191 239
Other (loss) income, net (1) (15) 9 (32) (65) (45) (1)
Total Revenues 4,205 3,142 6,889 6,220 11,855 9,091 8,543
Interest expense 128 113 245 222 435 387 312
Selling, general and administrative 337 304 646 623 1,241 1,017 1,012
Total Expenses 3,843 2,534 6,456 4,998 10,056 8,335 7,356
Income from continuing operations         1,765 747 1,231
Income from discontinued operations         0 (1) 1
Net income 450 584 551 1,180 1,765 746 1,232
Net income allocable to:              
Limited partner 237 286 286 524 743 200 239
General partner 3 3 3 5 8 2 21
Net income 450 584 551 1,180 1,765 746 1,232
Parent Company [Member]
              
Net gain from investment activities         7 2 3
Interest and dividend income         3 4 32
Loss on extinguishment of debt         0 (39) 0
Equity earnings from non-consolidated affiliates         976 445 371
Other (loss) income, net         14 11 8
Total Revenues         1,000 423 414
Interest expense         227 195 131
Selling, general and administrative         22 26 24
Total Expenses         249 221 155
Income from continuing operations         751 202 259
Income from discontinued operations         0 0 1
Net income         751 202 260
Net income allocable to:              
Limited partner         748 200 239
General partner         3 2 21
Net income         $ 751 $ 202 $ 260