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Financial Instruments and Risk Management (Hierarchy of Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Level 1 [Member]    
Disclosure of financial instruments [Line Items]    
Investments at fair value through other comprehensive income $ 0 $ 136
Level 2 [Member]    
Disclosure of financial instruments [Line Items]    
Derivatives designated as economic hedge, net 15 (32)
Derivatives designated as cash flow hedge, net 120 87
Total $ 135 $ 55