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Postretirement Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Y
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2014
Pension Plans [Member]
Dec. 31, 2013
Pension Plans [Member]
Dec. 31, 2012
Pension Plans [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2013
Pension Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2012
Pension Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2013
Pension Plans [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Pension Plans [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Pension Plans [Member]
Real estate and real assets [Member]
Dec. 31, 2012
Pension Plans [Member]
Real estate and real assets [Member]
Dec. 31, 2013
Pension Plans [Member]
Hedge Funds [Member]
Dec. 31, 2012
Pension Plans [Member]
Hedge Funds [Member]
Dec. 31, 2013
Pension Plans [Member]
Equity Securities [Member]
Dec. 31, 2012
Pension Plans [Member]
Equity Securities [Member]
Dec. 31, 2013
Pension Plans [Member]
Level 3 [Member]
Fixed Income Securities [Member]
Other [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Fixed Income Securities [Member]
Corporate [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Fixed Income Securities [Member]
Mortgage backed and asset backed [Member]
Dec. 31, 2013
Pension Plans [Member]
Level 3 [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Pension Plans [Member]
Level 3 [Member]
Real estate and real assets [Member]
Real Estate [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Real estate and real assets [Member]
Real Estate [Member]
Dec. 31, 2013
Pension Plans [Member]
Level 3 [Member]
Real estate and real assets [Member]
Real assets [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Real estate and real assets [Member]
Real assets [Member]
Dec. 31, 2013
Pension Plans [Member]
Level 3 [Member]
Hedge Funds [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Hedge Funds [Member]
Dec. 31, 2012
Pension Plans [Member]
Level 3 [Member]
Private Equity and Other Funds [Member]
Dec. 31, 2014
Other Postretirement Benefits Plans [Member]
Dec. 31, 2013
Other Postretirement Benefits Plans [Member]
Dec. 31, 2012
Other Postretirement Benefits Plans [Member]
Dec. 31, 2011
Other Postretirement Benefits Plans [Member]
Dec. 31, 2013
Other Postretirement Benefits Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2013
Other Postretirement Benefits Plans [Member]
Equity Securities [Member]
Sep. 30, 2011
Other Postretirement Benefits Plans [Member]
Postretirement Plan Adjustment [Member]
Defined Benefit Plan Disclosure [Line Items]                                                                      
Post retirement benefit obligation         $ 68,625 $ 75,895 $ 67,651                                             $ 7,008 $ 7,981 $ 7,997     $ 294
Net periodic benefit cost         3,449 3,010 2,343                                             320 373 784     184
Service cost         1,886 1,649 1,406                                             148 146 221     73
Interest cost         2,906 3,005 3,116                                             263 313 484     68
Recognized net actuarial loss         2,231 1,937 1,254                                             95 119 178     43
Net periodic benefit cost included in Earnings from operations         3,036 2,407 1,648                                             353 543 692     161
Other postretirement benefit adjustment included in inventory 42,912 37,751                                                                 23
Accumulated benefit obligation (ABO) for all pension plans         63,491 69,312                                                          
Moving average of plan assets, years 5                                                                    
Amount by which fair value of plan assets exceeds market-related value of plan assets (MRVA) 1,340                                                                    
Derivative net notional amount for fixed income as percentage of total plan assets 18.30% 10.00%                                                                  
Derivative net notional amount for global equity, currency overlay and commodities as a percentage of total plan assets (2.20%) (0.30%)                                                                  
Defined Benefit Plan, Actual Return on Plan Assets Still Held                                   21 (12) 36 422 243 579 71 62 283 101 113              
Defined benefit plan, actual plan asset allocations         100.00% 100.00%   49.00% 49.00% 5.00% 5.00% 8.00% 8.00% 5.00% 5.00% 29.00% 29.00%                               40.00% 60.00%  
Expected contributions       750                                                 12            
Expense for defined contribution plans $ 742 $ 708 $ 658