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Fair Value Measurements - Non-U.S. Pension Benefit Plans (Details) - Pension Benefit Plans - Non U.S. - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets $ 1,641 $ 1,438 $ 1,590
Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 1,641 1,438  
Recurring | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 49 50  
Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 1,540 1,343  
Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 69 140  
Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 398 492  
Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 903 651  
Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 170 60  
Recurring | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 4 3  
Recurring | Accrued income receivable      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 48 42  
Recurring | Level 1 | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 460 680  
Recurring | Level 1 | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 69 140  
Recurring | Level 1 | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 217 476  
Recurring | Level 1 | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 4 4  
Recurring | Level 1 | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 170 60  
Recurring | Level 2 | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 1,080 663  
Recurring | Level 2 | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Recurring | Level 2 | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 181 16  
Recurring | Level 2 | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 899 647  
Recurring | Level 2 | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets $ 0 $ 0