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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt
Long-term debt consisted of the following at December 31:
 
 
December 31, 2019
 
December 31, 2018
 
 
Principal Amount
 
Unamortized Discount and Debt Issuance Costs
 
Net Long-Term Debt
 
Principal Amount
 
Unamortized Discount and Debt Issuance Costs
 
Net Long-Term Debt
3.60% senior notes due 2022 (the "3.60% 2022 Senior Notes")
 
$
250

 
$
(1
)
 
$
249

 
$
250

 
$
(1
)
 
$
249

3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes")
 
750

 
(8
)
 
742

 
750

 
(9
)
 
741

Loan related to tax-exempt waste disposal revenue bonds due 2027
 
11

 
—

 
11

 
11

 
—

 
11

6 ½% senior notes due 2029 (the "6 ½% 2029 GO Zone Senior Notes")
 
100

 
(1
)
 
99

 
100

 
(1
)
 
99

6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes")
 
89

 
(1
)
 
88

 
89

 
(1
)
 
88

6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes")
 
65

 
—

 
65

 
65

 
—

 
65

5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes")
 
700

 
(23
)
 
677

 
700

 
(24
)
 
676

4.375% senior notes due 2047 (the "4.375% 2047 Senior Notes")
 
500

 
(9
)
 
491

 
500

 
(9
)
 
491

3.50% senior notes due 2032 (the "3.50% 2032 GO Zone Refunding Senior Notes")
 
250

 
(1
)
 
249

 
250

 
(2
)
 
248

1.625% senior notes due 2029 (the "1.625% 2029 Senior Notes")
 
785

 
(11
)
 
774

 
—

 
—

 
—

Long-term debt
 
$
3,500

 
$
(55
)
 
$
3,445

 
$
2,715

 
$
(47
)
 
$
2,668