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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]          
Beginning balance   $ (1,372) $ (1,298) $ (1,356) $ (1,415)
Other comprehensive income/(loss) before reclassifications   3 (18) (50) (18)
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   18 11 55 36
OPEB Plan amendment (Note 5) $ 92       92
Net to-date other comprehensive income/(loss), net of taxes   21 [2] (7) [2] 5 [3] 110 [3]
Balance at September 30 (1,298) (1,351) (1,305) (1,351) (1,305)
Deferred taxes activity other comprehensive income/(loss)   (6) (4) (18) (35)
Defined Benefit Plans [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Beginning balance   (1,110) (1,100) (1,150) (1,192)
Other comprehensive income/(loss) before reclassifications       3 (25)
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   18 11 55 36
OPEB Plan amendment (Note 5)         92
Net to-date other comprehensive income/(loss), net of taxes   18 11 58 103
Balance at September 30 (1,100) (1,092) (1,089) (1,092) (1,089)
Foreign Currency Translation [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Beginning balance   (262) (198) (206) (223)
Other comprehensive income/(loss) before reclassifications   3 (18) (53) 7
Net to-date other comprehensive income/(loss), net of taxes   3 (18) (53) 7
Balance at September 30 $ (198) $ (259) $ (216) $ (259) $ (216)
[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 ($6) million and ($4) million during the three months ended September 30, 2020 and 2019, respectively.
[3] Net of deferred taxes of ($18) million and ($35) million during the nine months ended September 30, 2020 and 2019, respectively.