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Long-term Employee Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]          
Decrease to net pension assets $ 158        
Settlement loss 380   $ 14 $ 381 $ (18)
Employer contributions during period     27 34 $ 51
Netherlands Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension benefits $ 932     $ 932  
Defined benefit plan loss partially offset by gain related to change in mortality assumption     7    
Defined benefit plan gain from change in other demographic assumptions     1    
Additional loss from unfavorable actuarial experience and other assumption changes     (3)    
Global Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan net actuarial loss     (33)    
Defined benefit plan decrease in discount rates resulted in loss     (38)    
Actual return on plan assets     55    
Defined benefit plan, incremental gains     $ 38    
Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer matching contribution percent of employees' gross pay   1.00%      
Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer matching contribution percent of employees' gross pay   7.00%      
Chemours [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer matching contribution percent of match   100.00%      
Employer matching contribution percent of employees' gross pay   6.00%      
Employer contribution vesting period   3 years