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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax        
Beginning balance $ 12,530 $ 12,530 $ 11,279 $ 10,850
Change in value (net of tax effect)   (287) (137) (459)
Reclassification into earnings (net of tax effect)   189 152 98
Ending balance   13,687 12,530 11,279
AOCI beginning balance, tax effect (1,400) (1,400) (1,458) (1,222)
Changes in value, tax effect   (88) (32) (293)
Reclassification into retained earnings, tax effect   (61)    
Reclassifications into earnings, tax effect   57 90 57
AOCI ending balance, tax effect   (1,492) (1,400) (1,458)
Deferred income taxes related to pension obligation   688    
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (7,621) (7,621) (7,636) (7,275)
Reclassifications into retained earnings (net of tax effect) (106)      
Ending balance   (7,825) (7,621) (7,636)
Pension and Other Benefits Liabilities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (7,812) (7,812) (7,714) (7,354)
Change in value (net of tax effect)   (294) (264) (482)
Reclassifications into retained earnings (net of tax effect) 0      
Reclassification into earnings (net of tax effect)   181 166 122
Ending balance   (7,925) (7,812) (7,714)
Deferred income taxes related to pension obligation     676 676
Derivative Contracts and Other        
AOCI Attributable to Parent, Net of Tax        
Beginning balance 85 85 114 151
Change in value (net of tax effect)   7 (23) (13)
Reclassifications into retained earnings (net of tax effect) 0      
Reclassification into earnings (net of tax effect)   8 (6) (24)
Ending balance   100 85 114
Available-for-Sale Investments        
AOCI Attributable to Parent, Net of Tax        
Beginning balance 106 106 (36) (72)
Change in value (net of tax effect)   0 150 36
Reclassifications into retained earnings (net of tax effect) $ (106)      
Reclassification into earnings (net of tax effect)   0 (8) 0
Ending balance   $ 0 $ 106 $ (36)