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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 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 130 117
Balance at March 31 151,566 147,790
Related income taxes 1,414 $ 430
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at January 1 (3,589)  
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 14  
Reclassifications 116  
Other Comprehensive Gain, Net of Tax 130  
Balance at March 31 (3,459)  
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 March 31 (95)  
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 (1)  
Reclassifications 0  
Other Comprehensive Gain, Net of Tax (1)  
Balance at March 31 (6)  
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 March 31 (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 5  
Reclassifications 116  
Other Comprehensive Gain, Net of Tax 121  
Balance at March 31 (3,356)  
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income    
Components of Other Comprehensive Income (Loss):    
Employee Benefits for reclassified components 153  
Related income taxes $ 37