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Retirement Benefits (Tables)
12 Months Ended
Dec. 31, 2010
Retirement Benefits (Table) [Abstract]  
Components of net periodic benefit cost
 
                                                 
                Medical and
    Pension Benefits   Life Benefits
$ in millions   2010   2009   2008   2010   2009   2008
Components of Net Periodic Benefit Cost
                                               
Service cost
  $ 531     $ 547     $ 591     $ 34     $ 34     $ 40  
Interest cost
    1,212       1,180       1,179       117       124       127  
Expected return on plan assets
    (1,517 )     (1,366 )     (1,665 )     (56 )     (48 )     (64 )
Amortization of
                                               
Prior service cost (credit)
    35       34       33       (51 )     (51 )     (51 )
Net loss from previous years
    206       289       23       18       19       8  
Other
            21       1                          
                                                 
Net periodic benefit cost
  $ 467     $ 705     $ 162     $ 62     $ 78     $ 60  
                                                 
 
Changes in unrecognized benefit plan costs
 
                         
    Pension
  Medical and
   
$ in millions   Benefits   Life Benefits   Total
Changes in Unamortized Benefit plan Costs
                       
Change in net actuarial loss
  $ 4,558     $ 132     $ 4,690  
Change in prior service cost
    73       30       103  
Amortization of
                       
Prior service (cost) credit
    (40 )     65       25  
Net loss from previous years
    (24 )     (22 )     (46 )
Tax benefits related to above items
    (1,807 )     (81 )     (1,888 )
                         
Change in unamortized benefit plan costs – 2008
  $ 2,760     $ 124     $ 2,884  
                         
Change in net actuarial loss
  $ (524 )   $ (60 )   $ (584 )
Change in prior service cost
    5               5  
Amortization of
                       
Prior service (cost) credit
    (50 )     59       9  
Net loss from previous years
    (337 )     (28 )     (365 )
Tax expense related to above items
    363       11       374  
                         
Change in unamortized benefit plan costs – 2009
  $ (543 )   $ (18 )   $ (561 )
                         
Change in net actuarial loss
  $ (158 )   $ (64 )   $ (222 )
Amortization of
                       
Prior service (cost) credit
    (48 )     60       12  
Net loss from previous years
    (244 )     (26 )     (270 )
Tax expense related to above items
    171       12       183  
                         
Change in unamortized benefit plan costs – 2010
  $ (279 )   $ (18 )   $ (297 )
                         
Amounts recorded in accumulated other comprehensive loss
 
                                 
    Pension Benefits   Medical and Life Benefits
$ in millions   2010   2009   2010   2009
Amounts Recorded in Accumulated Other Comprehensive Loss
                               
Net actuarial loss
  $ (4,246 )   $ (4,648 )   $ (361 )   $ (451 )
Prior service (cost) credit
    (194 )     (242 )     238       298  
Income tax benefits related to above items
    1,752       1,923       49       61  
                                 
Unamortized benefit plan costs
  $ (2,688 )   $ (2,967 )   $ (74 )   $ (92 )
                                 
 
Funded status of defined benefit plans
 
                                 
            Medical and
    Pension Benefits   Life Benefits
$ in millions   2010   2009   2010   2009
Change in Projected Benefit Obligation
                               
Projected benefit obligation at beginning of year
  $ 20,661     $ 19,391     $ 2,104     $ 2,056  
Service cost
    531       547       34       34  
Interest cost
    1,212       1,180       117       124  
Plan participants’ contributions
    10       10       82       91  
Plan amendments
            4                  
Actuarial loss (gain)
    633       755       (27 )     20  
Benefits paid
    (1,176 )     (1,261 )     (222 )     (238 )
Other
    (51 )     35       16       17  
                                 
Projected benefit obligation at end of year
    21,820       20,661       2,104       2,104  
                                 
Change in Plan Assets
                               
Fair value of plan assets at beginning of year
    18,184       16,204       843       718  
Gain on plan assets
    2,320       2,562       108       126  
Employer contributions
    789       657       105       129  
Plan participants’ contributions
    10       10       82       91  
Benefits paid
    (1,176 )     (1,261 )     (222 )     (238 )
Other
    (46 )     12       16       17  
                                 
Fair value of plan assets at end of year
    20,081       18,184       932       843  
                                 
Funded status
  $ (1,739 )   $ (2,477 )   $ (1,172 )   $ (1,261 )
                                 
Amounts recognized in the consolidated statements of financial position
                                 
Amounts Recognized in the Consolidated Statements of Financial Position
                               
Non-current assets
  $ 275     $ 148     $ 45     $ 36  
Current liability
    (94 )     (45 )     (48 )     (30 )
Non-current liability
    (1,920 )     (2,580 )     (1,169 )     (1,267 )
                                 
Amounts expected to be recognized in 2011 net periodic benefit cost
 
                 
    Pension
  Medical and
$ in millions   Benefits   Life Benefits
Amounts Expected to be Recognized in 2011 Net Periodic Benefit Cost
               
Net loss
  $ 161     $ 11  
Prior service cost (credit)
    23       (51 )
                 
Pension plans with accumulated benefit obligations in excess of plan assets
                 
    December 31
$ in millions   2010   2009
Projected benefit obligation
  $ 5,897     $ 18,637  
Accumulated benefit obligation
    5,314       17,339  
Fair value of plan assets
    4,447       16,043  
                 
Weighted-average plan assumptions
                                 
            Medical and
    Pension Benefits   Life Benefits
    2010   2009   2010   2009
Assumptions Used to Determine Benefit Obligation at December 31
                               
Discount rate
    5.75 %     6.03 %     5.62 %     5.77 %
Rate of compensation increase
    3.50 %     3.75 %                
Initial health care cost trend rate assumed for the next year
                    8.00 %     7.00 %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
                    5.00 %     5.00 %
Year that the rate reaches the ultimate trend rate
                    2017       2014  
Assumptions Used to Determine Benefit Cost for the Year Ended December 31
                               
Discount rate
    6.03 %     6.25 %     5.77 %     6.25 %
Expected long-term return on plan assets
    8.50 %     8.50 %     6.90 %     6.95 %
Rate of compensation increase
    3.75 %     4.00 %                
Initial health care cost trend rate assumed for the next year
                    7.00 %     7.50 %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
                    5.00 %     5.00 %
Year that the rate reaches the ultimate trend rate
                    2014       2014  
                                 
Effect of one-percentage point change in assumed health care cost trend rates
                 
    1-Percentage-
  1-Percentage-
$ in millions   Point Increase   Point Decrease
Increase (Decrease) From Change In Health Care Cost Trend Rates To
               
Post-retirement benefit expense
  $ 5     $ (6 )
Post-retirement benefit liability
    57       (68 )
                 
Plan asset allocation ranges
         
    Asset Allocation Ranges
Domestic equities
    10% – 30%  
International equities
    10% – 30%  
Fixed income securities
    30% – 50%  
Real estate and other
    10% – 30%  
         
Plan assets by fair value measurement input
 
                                                                 
    Level 1   Level 2   Level 3   Total
$ in millions   2010   2009   2010   2009   2010   2009   2010   2009
Asset Category
                                                               
Domestic equities
  $ 3,948     $ 3,164     $ 3             $ 2     $ 2     $ 3,953     $ 3,166  
International equities
    1,406       1,304       1,868     $ 1,353                       3,274       2,657  
Fixed income securities
                                                               
Cash and cash equivalents(1)
    92       122       1,111       1,850                       1,203       1,972  
U.S. Treasuries
                    1,381       1,151                       1,381       1,151  
Other U.S. Government Agency Securities
                    715       650                       715       650  
Non-U.S. Government Securities
                    224       193                       224       193  
Corporate debt
                    3,512       4,029                       3,512       4,029  
Asset backed
                    758       712       4       4       762       716  
High yield debt
                    992       493       78       59       1,070       552  
Bank loans
                    115       92                       115       92  
Real estate and other
                                                               
Hedge funds
                                    1,521       1,282       1,521       1,282  
Private equities
                                    1,945       1,651       1,945       1,651  
Real estate
                                    1,402       870       1,402       870  
Other(2)
                    (64 )     46                       (64 )     46  
                                                                 
Fair value of plan assets at the end of the year
  $ 5,446     $ 4,590     $ 10,615     $ 10,569     $ 4,952     $ 3,868     $ 21,013     $ 19,027  
                                                                 
 
(1) Cash & cash equivalents are predominantly held in money market funds
 
(2) Other includes futures, swaps, options, swaptions and insurance contracts year end.
Changes in fair value of plan assets, significant unobservable inputs (Table Amounts) [Abstract]
                                                         
    Domestic
  Asset
  High yield
  Hedge
  Private
       
$ in millions   equities   Backed   debt   funds   equities   Real estate   Total
Balance as of December 31, 2008
  $ 1     $ 4     $ 40     $ 1,152     $ 1,634     $ 1,148     $ 3,979  
Actual return on plan assets:
                                                       
Assets still held at reporting date
                    19       164       (109 )     (382 )     (308 )
Assets sold during the period
                            (10 )     1       (10 )     (19 )
Purchases, sales, and settlements
    1                       (24 )     125       114       216  
                                                         
Balance as of December 31, 2009
  $ 2     $ 4     $ 59     $ 1,282     $ 1,651     $ 870     $ 3,868  
                                                         
Actual return on plan assets:
                                                       
Assets still held at reporting date
    2               18       120       200       103       443  
Assets sold during the period
                                            (9 )     (9 )
Purchases, sales, and settlements
    (2 )                     89       63       405       555  
Changes in asset allocation mix
                    1       30       31       33       95  
                                                         
Balance as of December 31, 2010
  $ 2     $ 4     $ 78     $ 1,521     $ 1,945     $ 1,402     $ 4,952  
                                                         
Estimated benefit payments
                 
        Medical and
$ in millions   Pension Plans   Life Plans
Year Ending December 31
               
2011
  $ 1,106     $ 150  
2012
    1,163       153  
2013
    1,235       157  
2014
    1,315       161  
2015
    1,383       164  
2016 through 2020
    7,997       849