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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 156,118 $ 151,566 $ 155,642 $ 149,319
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (1) (11)
Reclassifications     188 232
Other Comprehensive Gain, Net of Tax 102 91 187 221
Ending balance 157,451 153,380 157,451 153,380
Related income taxes 1,645 1,483 2,960 2,897
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (3,459) (3,459) (3,544) (3,589)
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain, Net of Tax 102 91 187 221
Ending balance (3,357) (3,368) (3,357) (3,368)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (124) (105)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     1 (10)
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     1 (10)
Ending balance (123) (115) (123) (115)
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     0 (7)
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     0 (7)
Ending balance (10) (12) (10) (12)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (2) (2)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (1) 0
Reclassifications     0 0
Other Comprehensive Gain, Net of Tax     (1) 0
Ending balance (3) (2) (3) (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) 6
Reclassifications     188 232
Other Comprehensive Gain, Net of Tax     187 238
Ending balance $ (3,221) $ (3,239) (3,221) $ (3,239)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     243  
Related income taxes     $ 55