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Cash and Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2019
Cash and Marketable Securities [Abstract]  
Schedule Of Amortized Cost, Fair Value And Gross Unrealized Gains And Losses Of The Company's Short- And Long-Term Investments

Gross

Gross

Amortized

Unrealized

Unrealized

Fair

(In millions)

Cost

Gains

Losses

Value

Available-for-sale securities, September 30, 2019

Debt securities

$

7

$

$

$

7

Available-for-sale securities, December 31, 2018

Debt securities

$

9

$

$

$

9

Schedule Of Proceeds From Sale Of Securities, Maturities Of Available-for-sale Securities And Gross Realized (Gains) Losses

Three Months Ended

Nine Months Ended

September 30,

September 30,

(In millions)

2019

2018

2019

2018

Proceeds from sale of securities

$

$

16

$

$

17

Maturities of securities

5

6

9

15