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Pension Benefit Plans and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations Recognized in AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income      
Settlement $ (26) $ (74) $ (218)
U.S. | Pension Benefit Plans      
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income      
Current year actuarial (gain) loss (6) 86  
Amortization of prior service credit (41) (51)  
Settlement (22) (61)  
Other adjustments 5 (1)  
Total (64) (27)  
Changes in benefit obligations were recognized in accumulated other comprehensive income (64) (27)  
U.S. | Other Postretirement Benefits      
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income      
Current year actuarial (gain) loss 3 (8)  
Amortization of actuarial loss (1) (2)  
Amortization of prior service credit 8 7  
Total 10 (3)  
Non-U.S. | Pension Benefit Plans      
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income      
Current year actuarial (gain) loss 54 43  
Amortization of prior service credit (10) (11)  
Settlement (9) (13)  
Other adjustments 1 6  
Total 36 25  
Translation 8 (18)  
Changes in benefit obligations were recognized in accumulated other comprehensive income 44 7  
Non-U.S. | Other Postretirement Benefits      
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income      
Current year actuarial (gain) loss (15) (4)  
Total $ (15) $ (4)