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Equity (Details) (USD $)
In Millions, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Mar. 31, 2011
Common Stock, Shares, Outstanding beginning of period  75,316,419  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest  $ 1,599  
Net Income (Loss) Attributable to Parent2749118100 
Net Income (Loss) Attributable to Noncontrolling Interest0(1)0(1) 
Common Stock, Shares, Outstanding end of period75,345,351 75,345,351  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest1,656 1,656  
Common Stock, Capital Shares Reserved for Future Issuance    2,500,000
Common Stock [Member]
     
Common Stock, Shares, Outstanding beginning of period  75,316,41975,210,580 
Vesting of Restricted and Performance Stock Units, Shares  15,02473,421 
Stock Issued During Period, Shares, Employee Stock Purchase Plans  11,32014,846 
Shares Issued During Period, Dividend Reinvestment and Direct Stock Purchase Plan  2,588  
Common Stock, Shares, Outstanding end of period75,345,35175,298,84775,345,35175,298,847 
Common Stock Including Additional Paid in Capital [Member]
     
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest  831829 
Vesting of Restricted and Performance Stock Units, Value  00 
Stock Issued During Period, Value, Employee Stock Purchase Plan  00 
Stock Issued During Peirod, Value, Dividend Reinvestment and Direct Stock Purchase Plan  0  
Share-based Compensation  21 
Dividends, Common Stock  00 
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders  0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest833830833830 
Accumulated Other Comprehensive Income (Loss) [Member]
     
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest  (5)(6) 
Vesting of Restricted and Performance Stock Units, Value  00 
Stock Issued During Period, Value, Employee Stock Purchase Plan  00 
Share-based Compensation  00 
Dividends, Common Stock  00 
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders  0  
Other Comprehensive Income (Loss), Net of Tax   1 
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest(5)(5)(5)(5) 
Retained Earnings [Member]
     
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest  766719 
Vesting of Restricted and Performance Stock Units, Value  00 
Stock Issued During Period, Value, Employee Stock Purchase Plan  00 
Share-based Compensation  00 
Dividends, Common Stock  (59)(59) 
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders  0  
Net Income (Loss) Attributable to Parent  118100 
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest825760825760 
Noncontrolling Interest [Member]
     
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest  71 
Vesting of Restricted and Performance Stock Units, Value  00 
Stock Issued During Period, Value, Employee Stock Purchase Plan  00 
Share-based Compensation  00 
Dividends, Common Stock  00 
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders  (4)  
Net Income (Loss) Attributable to Noncontrolling Interest  0(1) 
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest$ 3$ 0$ 3$ 0