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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive (loss) income, net of tax $ (360) $ 296 $ (208) $ 552  
Unrealized Investment Gains          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 0 16 14 19  
Cumulative effect of new accounting principle in period of adoption         $ (14)
Other comprehensive income (loss) before reclassifications 0 14 0 11  
Amounts reclassified from accumulated other comprehensive income 0 0 0 0  
Other comprehensive (loss) income, net of tax 0 14 0 11  
Balance, ending of period 0 30 0 30  
Pension/Postretirement Plans Gains (Losses)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (2,963) (3,208) (2,892) (3,232)  
Cumulative effect of new accounting principle in period of adoption         0
Other comprehensive income (loss) before reclassifications 129 (40) 29 (46)  
Amounts reclassified from accumulated other comprehensive income 27 33 56 63  
Other comprehensive (loss) income, net of tax 156 (7) 85 17  
Balance, ending of period (2,807) (3,215) (2,807) (3,215)  
Foreign Currency Translation Gains (Losses)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (942) (1,645) (1,165) (1,880)  
Cumulative effect of new accounting principle in period of adoption         0
Other comprehensive income (loss) before reclassifications (516) 289 (293) 524  
Amounts reclassified from accumulated other comprehensive income 0 0 0 0  
Other comprehensive (loss) income, net of tax (516) 289 (293) 524  
Balance, ending of period (1,458) (1,356) (1,458) (1,356)  
AOCI Attributable to Parent          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (3,905) (4,837) (4,043) (5,093)  
Cumulative effect of new accounting principle in period of adoption         $ (14)
Other comprehensive income (loss) before reclassifications (387) 263 (264) 489  
Amounts reclassified from accumulated other comprehensive income 27 33 56 63  
Other comprehensive (loss) income, net of tax (360) 296 (208) 552  
Balance, ending of period $ (4,265) $ (4,541) $ (4,265) $ (4,541)