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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 $ 155,642 $ 149,319
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (9) 14
Reclassifications 94 116
Other Comprehensive Gain, Net of Tax 85 130
Balance at March 31 156,118 151,566
Related income taxes 1,315 1,414
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (3,544) (3,589)
Components of Other Comprehensive Income (Loss):    
Other Comprehensive Gain, Net of Tax 85 130
Balance at March 31 (3,459) (3,459)
Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (124) (105)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (4) 10
Reclassifications 0 0
Other Comprehensive Gain, Net of Tax (4) 10
Balance at March 31 (128) (95)
Unrealized Holding Gains (Losses) on Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (10) (5)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (1) (1)
Reclassifications 0 0
Other Comprehensive Gain, Net of Tax (1) (1)
Balance at March 31 (11) (6)
Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (2) (2)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 0 0
Reclassifications 0 0
Other Comprehensive Gain, Net of Tax 0 0
Balance at March 31 (2) (2)
Defined Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (3,408) (3,477)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (4) 5
Reclassifications 94 116
Other Comprehensive Gain, Net of Tax 90 121
Balance at March 31 (3,318) $ (3,356)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income    
Components of Other Comprehensive Income (Loss):    
Employee Benefits for reclassified components 121  
Related income taxes $ 27