v2.4.0.6
Long-Term Incentive Compensation Plans (Stock-based Compensation Plans) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-based compensation expense recorded in discontinued operations $ 3   $ 3
Tax benefit for stock-based compensation expense 306 383 382
Tax benefit for stock-based compensation expense included in discontinued operations 1   1
Unrecognized compensation cost related to unvested awards 709    
Unrecognized compensation cost will be recognized in 2013, absent estimated or actual forfeitures or cancellations 446    
Unrecognized compensation cost will be recognized in 2014, absent estimated or actual forfeitures or cancellations 175    
Unrecognized compensation cost will be recognized thereafter, absent estimated or actual forfeitures or cancellations 88    
Shares available for future grant 118    
Employee Who Satisfied Retirement Eligible Requirements under Award Terms that Do Not Contain Service Period
      
Stock-based compensation expense 31 186 222
Stock-based Compensation Plans
      
Stock-based compensation expense 897 [1] 1,113 [1] 1,115 [1]
Deferred Restricted Stock Units
      
Stock-based compensation expense 864 1,057 1,075
Stock Options
      
Stock-based compensation expense 4 24 1
Performance-based Stock Units
      
Stock-based compensation expense $ 29 $ 32 $ 39
[1] Amounts for 2012, 2011 and 2010 include $31 million, $186 million and $222 million, respectively, related to equity awards that were granted in 2013, 2012 and 2011, respectively, to employees who satisfied retirement-eligible requirements under the award terms that do not contain a future service period. The decrease in 2012 is due to the introduction of a new vesting requirement in certain 2012 performance year award terms for employees who satisfied the existing retirement eligible provisions to provide a one-year advance notice of their intention to retire from the Company. As such, these awards will begin to be expensed in 2013 after the grant date over the appropriate service period (see Note 2).