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Accumulated Other Comprehensive Income (Loss) (Summary of the Components of Accumulated Other Comprehensive Income (Loss) and Detail on Reclassifications) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Amounts reclassified from accumulated other comprehensive income (loss)        
Accumulated other comprehensive income (loss), beginning balance     $ (653) $ (531)
Other comprehensive income (loss) before reclassifications     (129) 29
Actuarial losses and settlements [2]     30 [1] 33 [3]
Other Comprehensive Income (Loss), Net of Tax $ (95) $ 225 (99) 62
Accumulated other comprehensive income (loss), ending balance (752) (469) (752) (469)
Defined Benefit Plans [Member]        
Amounts reclassified from accumulated other comprehensive income (loss)        
Accumulated other comprehensive income (loss), beginning balance     (662) (696)
Other comprehensive income (loss) before reclassifications     6 6
Actuarial losses and settlements [2]     30 [1] 33 [3]
Other Comprehensive Income (Loss), Net of Tax     36 39
Accumulated other comprehensive income (loss), ending balance (626) (657) (626) (657)
Foreign Curency Translation [Member]        
Amounts reclassified from accumulated other comprehensive income (loss)        
Accumulated other comprehensive income (loss), beginning balance     11 167
Other comprehensive income (loss) before reclassifications     (125) 23
Other Comprehensive Income (Loss), Net of Tax     (125) 23
Accumulated other comprehensive income (loss), ending balance (114) 190 (114) 190
Hedging [Member]        
Amounts reclassified from accumulated other comprehensive income (loss)        
Accumulated other comprehensive income (loss), beginning balance     (2) (2)
Other comprehensive income (loss) before reclassifications     (10)  
Other Comprehensive Income (Loss), Net of Tax     (10)  
Accumulated other comprehensive income (loss), ending balance $ (12) $ (2) $ (12) $ (2)
[1] There were no significant reclassifications related to foreign currency translation or hedging.
[2] These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 14—Employee Benefit Plans, for additional information).
[3] Includes excise taxes on petroleum products sales: