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Employee Benefit Benefits and Stock-Based Compensation - Annual Discretionary Bonus Grant (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits      
Accrued Bonuses, Current $ 103 $ 136 $ 124
Cash Payments for Employee Bonus $ 50 $ 72  
Expected Percent Of Bonus Paid In Stock     60.00%
Expected Percent of Bonus Paid in Cash     40.00%
Restricted Stock Unit Bonus Grant | Restricted Stock Units and Shares
     
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted or Expected to Be Granted in Next Fiscal Period 2.1 2.4