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Fair Value of Financial Instruments (Unaudited) (Details 1) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities $ 348 $ 382
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities 331 364
Derivatives 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities 1 1
Derivatives (1) (3)
Fair Value, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities 332 365
Derivatives (1) (3)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities 331 364
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities 1 1
Fair Value, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable Securities $ 16 $ 17