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Employee Benefit Benefits and Stock-Based Compensation - Restricted Stock and Units (Details) (Restricted Stock Units and Shares, USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
year
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Units and Shares
     
Share-based Compensation Arrangement by Share-based Payment Award      
Restrictions on transfer lapse, minimum (in years) 1    
Restrictions on transfer lapse, maximum (in years) 4    
Fair value of units and shares awarded $ 69 $ 35 $ 21
Unamortized compensation expense 43    
Weighted average period over which unamortized compensation cost will be recognized (in years) 2 years 9 months 15 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Nonvested, Beginning balance (in shares) 2,030,783 2,021,707 1,595,245
Stock and units granted (in shares) 2,869,584 1,030,676 1,182,353
Lapse of restrictions (in shares) (1,048,757) (845,717) (594,580)
Stock and units forfeited (in shares) (214,634) (175,883) (161,311)
Nonvested, Ending balance (in shares) 3,636,976 2,030,783 2,021,707
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Nonvested, Beginning balance, Weighted Average Grant Date Fair Value (in dollars per share) $ 26.25 $ 22.95 $ 33.30
Stock and units granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 24.13 $ 33.99 $ 17.55
Lapse of restrictions, Weighted Average Grant Date Fair Value (in dollars per share) $ 26.06 $ 27.79 $ 38.70
Stock and units forfeited, Weighted Average Grant Date Fair Value (in dollars per share) $ 24.92 $ 27.06 $ 26.55
Nonvested, Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) $ 24.71 $ 26.25 $ 22.95
Total fair value of restricted stock and restricted stock units whose restriction lapsed $ 27 $ 24 $ 23