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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 157,451 $ 153,380 $ 155,642 $ 149,319
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (27) (71)
Reclassifications     302 395
Other Comprehensive Gain, Net of Tax 88 103 275 324
Ending balance 156,892 154,673 156,892 154,673
Related income taxes 1,469 1,643 4,429 4,540
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (3,357) (3,368) (3,544) (3,589)
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain, Net of Tax 88 103 275 324
Ending balance (3,269) (3,265) (3,269) (3,265)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (124) (105)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (32) (12)
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     (32) (12)
Ending balance (156) (117) (156) (117)
Unrealized Holding Gains (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (10) (5)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     2 (6)
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     2 (6)
Ending balance (8) (11) (8) (11)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (2) (2)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     2 0
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     2 0
Ending balance 0 (2) 0 (2)
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (3,408) (3,477)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     1 (53)
Reclassifications     302 395
Other Comprehensive Gain, Net of Tax     303 342
Ending balance $ (3,105) $ (3,135) (3,105) $ (3,135)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     389  
Related income taxes     $ 87