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Retirement Benefits (Narrative) (Details) (USD $)
 9 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Pension Plans [Member]
Dec. 31, 2012
Pension Plans [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans [Member]
Dec. 31, 2013
Other Postretirement Benefit Plans [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans [Member]
Dec. 31, 2011
Other Postretirement Benefit Plans [Member]
Dec. 31, 2013
Other Postretirement Benefit Plans [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2013
United States Pension Plan of US Entity, Defined Benefit [Member]
Dec. 31, 2013
International Companies [Member]
Dec. 31, 2012
International Companies [Member]
Dec. 31, 2013
International Companies [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2012
International Companies [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2013
AA [Member]
Dec. 31, 2012
AA [Member]
Dec. 31, 2012
AA [Member]
Pension Plans [Member]
Dec. 31, 2013
AA [Member]
Pension Plans [Member]
Dec. 31, 2012
AA [Member]
Pension Plans [Member]
Dec. 31, 2011
AA [Member]
Pension Plans [Member]
Dec. 31, 2012
AA [Member]
Other Postretirement Benefit Plans [Member]
Dec. 31, 2013
AA [Member]
Other Postretirement Benefit Plans [Member]
Dec. 31, 2012
AA [Member]
Other Postretirement Benefit Plans [Member]
Dec. 31, 2011
AA [Member]
Other Postretirement Benefit Plans [Member]
Dec. 31, 2013
AA [Member]
Other Postretirement Benefit Plans [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2012
AA [Member]
Other Postretirement Benefit Plans [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2013
AA [Member]
United States Pension Plan of US Entity, Defined Benefit [Member]
Dec. 31, 2013
AA [Member]
International Companies [Member]
Dec. 31, 2012
AA [Member]
International Companies [Member]
Dec. 31, 2013
AA [Member]
International Companies [Member]
Unitized Mutual Funds [Member]
Dec. 31, 2012
AA [Member]
International Companies [Member]
Unitized Mutual Funds [Member]
Jan. 15, 2014
AA [Member]
Subsequent Event [Member]
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]                                                                      
Employer contributions       $ 494,000,000 $ 277,000,000     $ 103,000,000 $ 97,000,000       $ 489,000,000               $ 494,000,000 $ 277,000,000     $ 103,000,000 $ 97,000,000       $ 489,000,000         $ 34,000,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   120,000,000                               120,000,000                                  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 1,800,000,000                                   1,800,000,000                                
Super Saver 401(k) Company Match   5.50%                               5.50%                                  
Pilot Super Saver 401k Company Match   14.00%                               14.00%                                  
Defined Benefit Plan, Expected Long-term Return on Assets   8.00%   8.00% 8.25%     8.00% 8.25%                 8.00%     8.00% 8.25%     8.00% 8.25%                  
Defined Benefit Plan, Actual Plan Asset Allocations                           17.00% 16.00% 27.00% 28.00%                           17.00% 16.00% 27.00% 28.00%  
Fair value of plan assets       10,057,000,000 9,065,000,000 8,132,000,000 211,000,000 239,000,000 211,000,000 205,000,000 235,000,000 202,000,000               9,065,000,000 10,009,000,000 9,065,000,000 8,132,000,000 211,000,000 239,000,000 211,000,000 205,000,000 235,000,000 202,000,000            
The estimated net gain (loss) and prior service cost for the defined benefit pension plans       46,000,000       (8,000,000)                         (46,000,000)       8,000,000                    
Annualized ten-year rate of return on plan assets   8.93%                               8.93%                                  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Change Due to Subsequent Interim Measurement             .038                         .041       .038                      
Define benefit plan obligation to return collateral on loaned securities, net   0                               0                                  
Receivables And Payables for Foreign Currency Contracts, Net, Not Included in Fair Value of Plan Assets     7,000,000                               7,000,000                                
Defined Benefit Plans, Actuarial Loss at Remeasurement (1,900,000,000)                                   (1,900,000,000)                                
Recognized Unamortized Prior Service Cost (58,000,000)                                   (58,000,000)                                
Retiree Medical Plan, Plan Amendment Gain 1,900,000,000                                   1,900,000,000                                
Amortization period in years   8 years                               8 years                                  
Retiree Medical Plan, Net Gain Loss at Remeasurement 124,000,000                                   (124,000,000)                                
Recognized Unamortized Prior Service Cost - Retiree Medical 157,000,000                                   157,000,000                                
Retiree Medical Plan, Curtailment Gain Loss $ (33,000,000)                                   $ 33,000,000