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Quarterly Financial Data (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Quarterly Financial Information [Line Items]                      
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.                 $ (224) $ 100 $ 242
Cash dividends declared, per share $ 1.09 $ 0.91 $ 0.73 $ 2.00 $ 1.82 $ 1.64 $ 1.46   $ 3.82 $ 3.10 $ 2.185
Pension Plans [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments                 $ (290) $ (461) $ (104)
Pension Plans [Member] | defined benefit plan changes [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments               $ (334)      
B747 aircraft [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Reach-forward loss on commercial aircraft       $ (885)              
KC-46A Tanker [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.         $ (835)   $ (425)        
Tax Basis Restoration [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Tax Adjustments, Settlements, and Unusual Provisions             265        
2007-2008 Federal Tax Audit Settlement [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Tax Adjustments, Settlements, and Unusual Provisions             116        
2009-2010 Federal Tax Audit Settlement [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Tax Adjustments, Settlements, and Unusual Provisions             $ 143