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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt

Long-Term Debt.

 

December 31,

 

2020

 

 

2019

 

6.75% Notes, due 2024

 

$

750

 

 

$

750

 

7.00% Notes, due 2026

 

 

500

 

 

 

500

 

5.500% Notes, due 2027

 

 

750

 

 

 

—

 

6.125% Notes, due 2028

 

 

500

 

 

 

500

 

Other

 

 

6

 

 

 

84

 

Unamortized discounts and deferred financing costs

 

 

(41

)

 

 

(34

)

Total

 

 

2,465

 

 

 

1,800

 

Less: amount due within one year

 

 

2

 

 

 

1

 

Long-term debt, less amount due within one year

 

$

2,463

 

 

$

1,799