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Financial Instruments (Available for Sale Debt Securities) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Marketable Securities [Line Items]  
Debt Securities, Available-for-sale, Amortized Cost $ 101
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0
Debt Securities, Available-for-sale 101
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 99 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 2 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value 0 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 101 [1]
Municipal Bonds  
Marketable Securities [Line Items]  
Debt Securities, Available-for-sale, Amortized Cost 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0
Debt Securities, Available-for-sale 1
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 1 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 0 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value 0 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 1 [1]
Corporate Bonds  
Marketable Securities [Line Items]  
Debt Securities, Available-for-sale, Amortized Cost 100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0
Debt Securities, Available-for-sale 100
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 98 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 2 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value 0 [1]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 100 [1]
[1] Long term investments are included in Other noncurrent assets.