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Long-term Employee Benefits (Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 100.00% 100.00%  
Pension Plan [Member] | Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets $ 500 $ 1,268 $ 1,363
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 8.00% 5.00%  
Total pension assets before pension receivables $ 41 $ 67  
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 41 67  
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables $ 0 $ 0  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 52.00% 45.00%  
Total pension assets before pension receivables $ 102 $ 264  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 101 263  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables $ 1 $ 1  
Pension Plan [Member] | Foreign [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 40.00% 50.00%  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets $ 509 $ 1,260  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets 200 374  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets 309 886  
Pension Plan [Member] | Foreign [Member] | Pension Trust Payables, Net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets (9)    
Pension Plan [Member] | Foreign [Member] | Government Issued [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 150 487  
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 9 3  
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 141 484  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 51 130  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 47 33  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 4 97  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member}      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 135 296  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member} | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 0 0  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member} | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 135 296  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 28 9  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 0 0  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 28 9  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension liability before pension receivables 0 (5)  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension liability before pension receivables 0 0  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension liability before pension receivables 0 (5)  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 2 12  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables 2 8  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets before pension receivables $ 0 4  
Pension Plan [Member] | Foreign [Member] | Pension Trust Receivables, Net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets   $ 8