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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance $ (1,422) $ (1,252) $ (1,141) $ (1,272)
Other comprehensive income/(loss) before reclassifications (25) 17 (25) 23
Amounts reclassified from accumulated other comprehensive income/(loss) [1] 19 14 38 28
Net to-date other comprehensive income/(loss), net of taxes (6) [2] 31 [2] 13 [3] 51 [3]
Reclassification of AOCI to retained earnings due to ASU 2018-02     (300)  
Balance at June 30 (1,428) (1,221) (1,428) (1,221)
Deferred taxes activity other comprehensive income/(loss) (7) (18) (13) (32)
Defined Benefit Plans [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (1,235) (1,121) (1,029) (1,132)
Other comprehensive income/(loss) before reclassifications (1) 1 (1) (2)
Amounts reclassified from accumulated other comprehensive income/(loss) [1] 19 14 38 28
Net to-date other comprehensive income/(loss), net of taxes 18 15 37 26
Reclassification of AOCI to retained earnings due to ASU 2018-02     (225)  
Balance at June 30 (1,217) (1,106) (1,217) (1,106)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (187) (131) (112) (140)
Other comprehensive income/(loss) before reclassifications (24) 16 (24) 25
Amounts reclassified from accumulated other comprehensive income/(loss)    
Net to-date other comprehensive income/(loss), net of taxes (24) 16 (24) 25
Reclassification of AOCI to retained earnings due to ASU 2018-02     (75)  
Balance at June 30 $ (211) $ (115) $ (211) $ (115)
[1] The accumulated other comprehensive income/(loss) reclassification components are 1) prior service cost/(credit) and 2) net actuarial loss which are both included in the computation of net periodic pension cost. See Note 6 Retirement Plans for additional details.
[2] Net of deferred taxes of $(7) million and $(18) million during the three months ended June 30, 2018, and 2017, respectively.
[3] $(13) million and $(32) million during the six months ended June 30, 2018, and 2017, respectively.