XML 151 R107.htm IDEA: XBRL DOCUMENT v2.4.0.6
Postretirement Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Level 3 [Member]
Corporate [Member]
Dec. 31, 2012
Level 3 [Member]
Mortgage Backed And Asset Backed [Member]
Dec. 31, 2012
Level 3 [Member]
Private equity [Member]
Dec. 31, 2011
Level 3 [Member]
Private equity [Member]
Dec. 31, 2012
Level 3 [Member]
Real Estate [Member]
Dec. 31, 2011
Level 3 [Member]
Real Estate [Member]
Dec. 31, 2012
Level 3 [Member]
Real assets [Member]
Dec. 31, 2011
Level 3 [Member]
Real assets [Member]
Dec. 31, 2012
Level 3 [Member]
Hedge funds [Member]
Dec. 31, 2011
Level 3 [Member]
Hedge funds [Member]
Dec. 31, 2012
Other Postretirement Benefits Plans [Member]
Dec. 31, 2011
Other Postretirement Benefits Plans [Member]
Dec. 31, 2010
Other Postretirement Benefits Plans [Member]
Dec. 31, 2012
Other Postretirement Benefits Plans [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits Plans [Member]
Debt Securities [Member]
Dec. 31, 2012
Pension Plans [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2010
Pension Plans [Member]
Dec. 31, 2012
Pension Plans [Member]
Equity securities [Member]
Dec. 31, 2011
Pension Plans [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Plans [Member]
Debt Securities [Member]
Dec. 31, 2011
Pension Plans [Member]
Debt Securities [Member]
Sep. 30, 2011
Postretirement Plan Adjustment [Member]
Other Postretirement Benefits Plans [Member]
Dec. 31, 2010
Postretirement Plan Adjustment [Member]
Other Postretirement Benefits Plans [Member]
Dec. 31, 2010
Revised Liability Due To Adjustment [Member]
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]                                                        
Post retirement benefit obligation                           $ 7,981 $ 7,997 $ 8,546     $ 75,895 $ 67,651 $ 59,106         $ 294 $ 274 $ 8,820
Net periodic benefit cost                           373 784 497     3,010 2,343 1,367         184    
Service cost                           146 221 121     1,649 1,406 1,176         73    
Interest cost                           313 484 404     3,005 3,116 3,002         68    
Recognized net actuarial loss                           (119) (178) (56)     (1,937) (1,254) (777)         43    
Net periodic benefit cost included in Earnings from operations                           543 692 480     2,407 1,648 1,101         161    
Other postretirement benefit adjustment included in inventory 37,751 32,240                                               23    
Accumulated benefit obligation (ABO) for all pension plans                                     69,312 61,902                
Moving average of plan assets, years 5                                                      
Amount by which fair value of plan assets exceeds market-related value of plan assets (MRVA) (3,581)                                                      
Derivative notional amount for fixed income as percentage of total plan assets 10.00% 3.90%                                                    
Derivative notional amount for global equity, currency overlay and commodities as a percentage of total plan assets (0.30%) 3.50%                                                    
Defined Benefit Plan, Actual Return on Plan Assets Still Held       (12) 36 113 234 579 205 62 82 101 (46)                              
Defined benefit plan, actual plan asset allocations                                 60.00% 40.00% 100.00% 100.00%   29.00% 26.00% 49.00% 53.00%      
Expected contributions                           13         1,500                  
Expense for defined contribution plans $ 708 $ 658 $ 614