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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at January 1   $ (1,356) $ (1,415)  
Other comprehensive income/(loss) before reclassifications   (4) (69)  
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   (233) 36  
OPEB Plan amendment (Note 5) $ 92   92  
Net year-to-date other comprehensive income/(loss), net of taxes [2]   (237) 59 $ 26
Balance at December 31   (1,593) (1,356) (1,415)
Deferred taxes activity other comprehensive income/(loss)   75 (15) (22)
Defined Benefit Plans [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at January 1   (1,150) (1,192)  
Other comprehensive income/(loss) before reclassifications   2 (86)  
Amounts reclassified from accumulated other comprehensive income/(loss) [1]   (233) 36  
OPEB Plan amendment (Note 5)     92  
Net year-to-date other comprehensive income/(loss), net of taxes   (231) 42  
Balance at December 31   (1,381) (1,150) (1,192)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at January 1   (206) (223)  
Other comprehensive income/(loss) before reclassifications   (6) 17  
Amounts reclassified from accumulated other comprehensive income/(loss) [1]    
Net year-to-date other comprehensive income/(loss), net of taxes   (6) 17  
Balance at December 31   $ (212) $ (206) $ (223)
[1] [a] 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 $75 million, ($15) million, and ($22) million during 2020, 2019, and 2018, respectively.