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Employee Benefits (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]      
Actual return (loss) on plan assets $ 14 $ 61 $ (1)
Expenses recorded in respect of defined contribution plans 39 $ 37 $ 35
The Company's estimate of deposits expected in funded defined benefit plans for 2019 $ 9    
Life of defined benefit plans 15 years 3 months 20 days 14 years 3 months 19 days