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Summary of Significant Accounting Policies (Earnings Per Share) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basic earnings per share - continuing operations:    
Income from continuing operations available to common shareholders $ 259 $ 177
Weighted average common shares outstanding (in shares) 326,000,000 326,000,000
Basic earnings per share – continuing operations (in dollars per share) $ 0.79 $ 0.54
Diluted earnings per share - continuing operations:    
Income from continuing operations available to common shareholders 259 177
Income impact of assumed conversions 0 0
Income from continuing operations available to common shareholders and assumed conversions $ 259 $ 177
Weighted average common shares outstanding (in shares) 326,000,000 326,000,000
Incremental shares from assumed conversions (in shares) 3,000,000 3,000,000
Adjusted weighted average shares - diluted (in shares) 329,000,000 329,000,000
Diluted earnings per share – continuing operations (in dollars per share) $ 0.78 $ 0.54
Stock-Based Compensation Awards
   
Diluted earnings per share - continuing operations:    
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) 4,455,669 8,602,107