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Pension and Postretirement Benefit Plans - Amounts Recognized in the Balance Sheet and Amounts Recognized in AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in the balance sheet:    
Noncurrent assets $ 3 $ 3
Noncurrent liabilities (561) (607)
Pension Plan [Member] | UNITED STATES    
Amounts recognized in the balance sheet:    
Current liabilities
Noncurrent liabilities (200) (217)
Net amount recognized (200) (217)
Amounts recognized in AOCI:    
Net actuarial loss (gain) 542 559
AOCI before tax 542 559
Deferred taxes (6) (10)
Net 536 549
Pension Plan [Member] | Foreign Plan [Member]    
Amounts recognized in the balance sheet:    
Noncurrent assets 3 3
Current liabilities (13) (13)
Noncurrent liabilities (283) (296)
Net amount recognized (293) (306)
Amounts recognized in AOCI:    
Net actuarial loss (gain) 84 88
AOCI before tax 84 88
Deferred taxes (22) (22)
Net 62 66
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]    
Amounts recognized in the balance sheet:    
Current liabilities (5) (5)
Noncurrent liabilities (78) (94)
Net amount recognized (83) (99)
Amounts recognized in AOCI:    
Net actuarial loss (gain) (15) (8)
AOCI before tax (15) (8)
Deferred taxes 4 3
Net $ (11) $ (5)