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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning balance $ (1,593) $ (1,356)
Other comprehensive income/(loss) before reclassifications (27) 7
Amounts reclassified from accumulated other comprehensive income/(loss) [1] 26 20
Net to-date other comprehensive income/(loss), net of taxes [2] (1) 27
Balance at March 31 (1,594) (1,329)
Deferred taxes activity other comprehensive income/(loss) (8) (7)
Defined Benefit Plans [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning balance (1,381) (1,150)
Other comprehensive income/(loss) before reclassifications (1) 2
Amounts reclassified from accumulated other comprehensive income/(loss) [1] 26 20
Net to-date other comprehensive income/(loss), net of taxes 25 22
Balance at March 31 (1,356) (1,128)
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning balance (212) (206)
Other comprehensive income/(loss) before reclassifications (26) 5
Net to-date other comprehensive income/(loss), net of taxes (26) 5
Balance at March 31 $ (238) $ (201)
[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 ($8) million and ($7) million during the three months ended March 31, 2021 and 2020, respectively.