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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance   $ (1,356) $ (1,415)
Other comprehensive income/(loss) before reclassifications   7 24
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   20 13
OPEB Plan amendment (Note 5) $ 92    
Net to-date other comprehensive income/(loss), net of taxes [2]   27 37
Balance at March 31   (1,329) (1,378)
Deferred taxes activity other comprehensive income/(loss)   (7) (4)
Defined Benefit Plans [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance   (1,150) (1,192)
Other comprehensive income/(loss) before reclassifications   2 (3)
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   20 13
Net to-date other comprehensive income/(loss), net of taxes   22 10
Balance at March 31   (1,128) (1,182)
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance   (206) (223)
Other comprehensive income/(loss) before reclassifications   5 27
Net to-date other comprehensive income/(loss), net of taxes   5 27
Balance at March 31   $ (201) $ (196)
[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 5 Retirement Plans for additional details.
[2] Net of deferred taxes of ($7) million and ($4) million during the three months ended March 31, 2020, and 2019, respectively.