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Long-term Employee Benefits (Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 604 $ 500 $ 1,268
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 7.00% 8.00%  
Total pension assets at fair value $ 43 $ 41  
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 43 41  
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value $ 0 $ 0  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 37.00% 52.00%  
Total pension assets at fair value $ 220 $ 102  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 33 101  
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value $ 187 $ 1  
Pension Plan [Member] | Foreign [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total weighted-average allocation 56.00% 40.00%  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets at Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets $ 576 $ 509  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets at Fair Value [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets 128 200  
Pension Plan [Member] | Foreign [Member] | Total Pension Assets at Fair Value [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets 448 309  
Pension Plan [Member] | Foreign [Member] | Pooled Mortgage Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets 28    
Pension Plan [Member] | Foreign [Member] | Government Issued [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 60 150  
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 10 9  
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 50 141  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 158 51  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 42 47  
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 116 4  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value   135  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value   0  
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value   135  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 93 28  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 0 0  
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 93 28  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 2 2  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value 0 2  
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets at fair value $ 2 0  
Pension Plan [Member] | Foreign [Member] | Pension Trust Payables, Net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total pension assets   $ (9)