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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     $ 149,319 $ 146,722
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain, Net of Tax $ 91 $ 122 221 239
Balance at June 30 153,380 147,388 153,380 147,388
Related income taxes 1,483 $ 487 2,897 $ 917
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     (3,589)  
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (11)  
Reclassifications     232  
Other Comprehensive Gain, Net of Tax     221  
Balance at June 30 (3,368)   (3,368)  
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     (105)  
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (10)  
Reclassifications     0  
Other Comprehensive Gain, Net of Tax     (10)  
Balance at June 30 (115)   (115)  
Unrealized Holding Gains (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     (5)  
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (7)  
Reclassifications     0  
Other Comprehensive Gain, Net of Tax     (7)  
Balance at June 30 (12)   (12)  
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     (2)  
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     0  
Reclassifications     0  
Other Comprehensive Gain, Net of Tax     0  
Balance at June 30 (2)   (2)  
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at January 1     (3,477)  
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     6  
Reclassifications     232  
Other Comprehensive Gain, Net of Tax     238  
Balance at June 30 $ (3,239)   (3,239)  
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     301  
Related income taxes     $ 69