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Long-term Employee Benefits (Schedule of Net Periodic Pension (Cost) Income and Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]        
Total net periodic pension (cost) income $ (380) $ (14) $ (381) $ 18
Net gain (loss)   4 (144) (115)
Prior service (cost) benefit, pre-tax   (1) 5 0
Amortization of actuarial loss, pre-tax   9 18 16
Amortization of prior service gain   (3) (2) (2)
Curtailment gain   4 0 0
Effect of foreign exchange rates   (9) 7 8
Benefit (cost) recognized in other comprehensive income   9 267 (93)
Pension Plan [Member] | Foreign [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   (15) (13) (14)
Interest cost   (6) (17) (16)
Expected return on plan assets   17 48 58
Amortization of actuarial loss   (9) (18) (12)
Amortization of prior service gain   3 2 2
Settlement loss   (5) (383)  
Curtailment gain   1    
Total net periodic pension (cost) income   (14) (381) 18
Net gain (loss)   4 (144) (115)
Prior service (cost) benefit, pre-tax   (1) 5  
Amortization of actuarial loss, pre-tax   9 18 16
Amortization of prior service gain   (3) (2) (2)
Settlement loss   5 383  
Curtailment gain   4    
Effect of foreign exchange rates   (9) 7 8
Benefit (cost) recognized in other comprehensive income   9 267 (93)
Total changes in plan assets and benefit obligations recognized in other comprehensive income   $ (5) $ (114) $ (75)