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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plan      
Net loss      
Balance at beginning of period $ 1,962 $ 2,057 $ 2,032
Reclassification to net periodic benefit cost (137) (134) (95)
Current year gain (loss) (53) 103 21
Amendments 0 0 0
Foreign currency translation 36 (64) 99
Balance at end of period 1,808 1,962 2,057
Prior service      
Balance at beginning of period (6) (16) (32)
Reclassification to net periodic benefit cost 14 10 14
Current year gain (loss) 0 0 0
Amendments 0 0 4
Foreign currency translation 0 0 (2)
Balance at end of period 8 (6) (16)
Other Postretirement Benefits      
Net loss      
Balance at beginning of period 31 49 49
Reclassification to net periodic benefit cost (3) (4) (4)
Current year gain (loss) 14 (14) 4
Amendments 0 0 0
Balance at end of period 42 31 49
Prior service      
Balance at beginning of period (105) (142) (182)
Reclassification to net periodic benefit cost 34 37 40
Current year gain (loss) 0 0 0
Amendments (1) 0 0
Balance at end of period $ (72) $ (105) $ (142)