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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Decrease to net pension assets $ 158        
Settlement loss 380   $ 381 $ (18) $ (22)
Employer contributions during period     34 $ 51 $ 45
Netherlands Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension benefits $ 932   $ 932    
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%      
Parent Issuer [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