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Schedule I - Condensed Financial Information of Parent Condensed Financial Information of Parent Company - Cash Flows (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
Dec. 31, 2008
Net income $ 450 $ 584 $ 551 $ 1,180 $ 1,765 $ 746 $ 1,232  
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                
Net gain from securities transactions     (765) (1,171) (1,927) (814) (1,406)  
Depreciation and amortization     253 220 446 463 440  
Other, net     47 (35) (28) (65) (162)  
Increase (Decrease) in Other Operating Assets and Liabilities, Net     160 264        
Net cash provided by operating activities     1,407 1,380 1,995 39 365  
Capital expenditures     (429) (218) (481) (422) (230)  
Payments to Acquire Investments     210 0 0 0 38  
Proceeds from sale of investments     170 0 154 4 65  
Other, net     17 7 5 (9) (50)  
Net cash used in investing activities     (1,743) (246) (614) (311) (253)  
Distribution Made to Member or Limited Partner, Cash Distributions Paid     20 31 48 85 77  
Partnership contributions     510 0 0 6 0  
Proceeds from other borrowings     163 604 607 107 352  
Repayments of Debt and Capital Lease Obligations     63 253 675 1,389 192  
Net cash provided by (used in) financing activities     1,267 (1,517) (2,046) 985 (792)  
Net increase (decrease) in cash and cash equivalents     931 (358) (687) 707 (661)  
Cash and cash equivalents 3,209 2,607 3,209 2,607 2,278 2,963 2,256 2,917
Parent Company [Member]
                
Net income         751 202 260  
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                
Equity earnings from non-consolidated affiliates         (976) (445) (371)  
Net gain from securities transactions         (7) (2) (3)  
Depreciation and amortization         2 5 5  
Loss on extinguishment of debt         0 39 0  
Other, net         0 26 9  
Increase (Decrease) in Other Operating Assets and Liabilities, Net         (10) 29 11  
Net cash provided by operating activities         (240) (146) (89)  
Payments to Acquire Equity Method Investments         109 (855) (207)  
Capital expenditures         0 0 (1)  
Payments to Acquire Investments         0 0 0  
Proceeds from sale of investments         0 65 172  
Other, net         2 2 1  
Net cash used in investing activities         111 (788) (35)  
Distribution Made to Member or Limited Partner, Cash Distributions Paid         (48) (85) (77)  
Partnership contributions         0 3 0  
Proceeds from other borrowings         0 2,487 0  
Repayments of Debt and Capital Lease Obligations         (3) (1,349) (8)  
Net cash provided by (used in) financing activities         (51) 1,056 (85)  
Net increase (decrease) in cash and cash equivalents         (180) 122 (209)  
Cash and cash equivalents         $ 24 $ 204 $ 82 $ 291