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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 $ 146,722 $ 153,886  
Components of Other Comprehensive Income (Loss):      
Other Comprehensive Gain, Net of Tax 254 448 $ 568
Balance at December 31 149,319 146,722 153,886
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 (3,843) (4,291)  
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (256)    
Reclassifications 510    
Other Comprehensive Gain, Net of Tax 254    
Balance at December 31 (3,589) (3,843) (4,291)
Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 (162) (140) (96)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 57    
Reclassifications 0    
Other Comprehensive Gain, Net of Tax 57 (22) (44)
Balance at December 31 (105) (162) (140)
Unrealized Holding Gains (Losses) on Securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 (2) (29) (8)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (3)    
Reclassifications 0    
Other Comprehensive Gain, Net of Tax (3) 27 (21)
Balance at December 31 (5) (2) (29)
Derivatives      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 (2) (2) (2)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 0    
Reclassifications 0    
Other Comprehensive Gain, Net of Tax 0 0 0
Balance at December 31 (2) (2) (2)
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at January 1 (3,677) (4,120) (4,753)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (310)    
Reclassifications 510    
Other Comprehensive Gain, Net of Tax 200 443 633
Balance at December 31 (3,477) $ (3,677) $ (4,120)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income      
Components of Other Comprehensive Income (Loss):      
Reclassification, before tax amount 796    
Reclassification, tax amount $ 286