Financial Instruments (Available for Sale Debt Securities) (Details) $ in Millions	Dec. 31, 2019 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
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	101
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
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	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
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Years, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 100

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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