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Pension and Other Postretirement Benefits (Schedule of Changes in Net Loss and Prior Service Cost/(Credit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Net loss      
Balance at beginning of period $ 1,808 $ 1,962 $ 2,057
Reclassification to net periodic benefit cost (150) (137) (134)
Current year gain / (loss) 118 (53) 103
Amendments 0 0 0
Foreign currency translation 26 36 (64)
Balance at end of period 1,802 1,808 1,962
Prior service      
Balance at beginning of period 8 (6) (16)
Reclassification to net periodic benefit cost (1) 14 10
Current year gain / (loss) 0 0 0
Amendments 1 0 0
Foreign currency translation 0 0 0
Balance at end of period 8 8 (6)
Other Postretirement Benefits      
Net loss      
Balance at beginning of period 42 31 49
Reclassification to net periodic benefit cost (4) (3) (4)
Current year gain / (loss) 7 14 (14)
Amendments 0 0 0
Balance at end of period 45 42 31
Prior service      
Balance at beginning of period (72) (105) (142)
Reclassification to net periodic benefit cost 26 34 37
Current year gain / (loss) 0 0 0
Amendments 0 (1) 0
Balance at end of period $ (46) $ (72) $ (105)