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Long-term Employee Benefits (Schedule of Net Periodic Pension Income and Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net periodic pension cost (income):        
Net periodic pension cost (income) $ 380 $ 381 $ (18) $ (22)
Changes in plan assets and benefit obligations recognized in other comprehensive income:        
Net loss (gain)   144 115 (24)
Amortization of actuarial loss   (18) (16) (24)
Prior service gain   (5) 0 0
Amortization of prior service gain   2 2 2
Effect of foreign exchange rates   (7) (8) 38
(Benefit) cost recognized in other comprehensive income   (267) 93 (8)
Pension Plan [Member] | Foreign [Member]        
Net periodic pension cost (income):        
Service cost   13 14 16
Interest cost   17 16 16
Expected return on plan assets   (48) (58) (75)
Amortization of prior service gain   (2) (2) (2)
Amortization of actuarial loss   18 12 22
Settlement loss   383   1
Net periodic pension cost (income)   381 (18) (22)
Changes in plan assets and benefit obligations recognized in other comprehensive income:        
Net loss (gain)   144 115 (24)
Amortization of actuarial loss   (18) (16) (24)
Prior service gain   (5)    
Amortization of prior service gain   2 2 2
Settlement loss   (383)    
Effect of foreign exchange rates   (7) (8) 38
(Benefit) cost recognized in other comprehensive income   (267) 93 (8)
Total net periodic pension income and cost (benefit) recognized in other comprehensive income   $ 114 $ 75 $ (30)