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Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance $ 12,770    
Other comprehensive earnings (losses) before reclassifications (296) $ (135)  
Other comprehensive deferred income taxes 104 58  
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes (192) (77)  
Amounts reclassified to net earnings 54 48  
Amounts reclassified to net earnings, deferred income taxes (22) (18)  
Amounts reclassified to net earnings, net of deferred income taxes 32 30  
Other comprehensive earnings (losses), net of deferred income taxes (160) (47) $ 1,228
Ending balance 12,260   12,770
Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (4) (5) (5)
Other comprehensive earnings (losses) before reclassifications 0 1  
Other comprehensive deferred income taxes 0 0  
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes 0 1  
Amounts reclassified to net earnings 0 0  
Amounts reclassified to net earnings, deferred income taxes 0 0  
Amounts reclassified to net earnings, net of deferred income taxes 0 0  
Other comprehensive earnings (losses), net of deferred income taxes 0 1  
Ending balance (4) (4) (4)
Benefit Plans [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (2,048) (2,010) (2,010)
Other comprehensive earnings (losses) before reclassifications 0 (318)  
Other comprehensive deferred income taxes 0 122  
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes 0 (196)  
Amounts reclassified to net earnings 54 36  
Amounts reclassified to net earnings, deferred income taxes (22) (14)  
Amounts reclassified to net earnings, net of deferred income taxes 32 22  
Other comprehensive earnings (losses), net of deferred income taxes 32 (174)  
Ending balance (2,016) (2,184) (2,048)
Accumulated Equity Method Investments Attributable to Parent [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance 0 (1,265) (1,265)
Other comprehensive earnings (losses) before reclassifications (296) 182  
Other comprehensive deferred income taxes 104 (64)  
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes (192) 118  
Amounts reclassified to net earnings 0 12  
Amounts reclassified to net earnings, deferred income taxes 0 (4)  
Amounts reclassified to net earnings, net of deferred income taxes 0 8  
Other comprehensive earnings (losses), net of deferred income taxes (192) 126  
Ending balance (192) (1,139) 0
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (2,052) (3,280) (3,280)
Other comprehensive earnings (losses), net of deferred income taxes (160)   1,228
Ending balance $ (2,212) $ (3,327) $ (2,052)