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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 17, 2019 | Nov. 30, 2017 | Aug. 10, 2016 | Jul. 31, 2012 | Dec. 31, 2010
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross Excluding Current Maturities | $ 3,620 | $ 3,500 |  |  |  |  |
Debt Instrument, Unamortized Premium (Discount) and Debt Issuance Cost, Net, Excluding Current Maturities | (54) | (55) |  |  |  |  |
Long-term Debt, Excluding Current Maturities | $ 3,566 | 3,445 |  |  |  |  |
Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 3.60% |  |  |  |  |  |
Principal amount | $ 250 | 250 |  |  |  | $ 250 |
Unamortized Premium (Discount) and Debt Issuance Costs | (1) | (1) |  |  |  |  |
Long-term debt, net | $ 249 | 249 |  |  |  |  |
Senior Notes [Member] | 3.60% Senior Notes Due 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 3.60% |  |  |  |  |  |
Principal amount | $ 750 | 750 |  |  | $ 750 |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (6) | (8) |  |  |  |  |
Long-term debt, net | 744 | 742 |  |  |  |  |
Senior Notes [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | 11 | 11 |  |  |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | 0 |  |  |  |  |
Long-term debt, net | $ 11 | 11 |  |  |  |  |
Senior Notes [Member] | 6 1/2% GO Zone Senior Notes Due 2029 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 6.50% |  |  |  |  |  |
Principal amount | $ 0 | 100 |  |  |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | (1) |  |  |  |  |
Long-term debt, net | $ 0 | 99 |  |  |  |  |
Senior Notes [Member] | 6 1/2% GO Zone Senior Notes Due 2035 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 6.50% |  |  |  |  |  |
Principal amount | $ 0 | 89 |  |  |  |  | $ 89
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | (1) |  |  |  |  |
Long-term debt, net | $ 0 | 88 |  |  |  |  |
Senior Notes [Member] | 6.5% 2035 IKE Zone Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 6.50% |  |  |  |  |  |
Principal amount | $ 0 | 65 |  |  |  |  | $ 65
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | 0 |  |  |  |  |
Long-term debt, net | $ 0 | 65 |  |  |  |  |
Senior Notes [Member] | 5.0% 2046 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 5.00% |  |  |  |  |  |
Principal amount | $ 700 | 700 |  |  | $ 700 |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (23) | (23) |  |  |  |  |
Long-term debt, net | $ 677 | 677 |  |  |  |  |
Senior Notes [Member] | 4.375% Senior Notes Due 2047 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 4.375% |  |  |  |  |  |
Principal amount | $ 500 | 500 |  | $ 500 |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (9) | (9) |  |  |  |  |
Long-term debt, net | $ 491 | 491 |  |  |  |  |
Senior Notes [Member] | 3.50% Senior Notes Due 2032 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 3.50% |  |  |  |  |  |
Principal amount | $ 250 | 250 |  |  |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (1) | (1) |  |  |  |  |
Long-term debt, net | $ 249 | 249 |  |  |  |  |
Senior Notes [Member] | 1.625% Senior Notes Due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 1.625% |  |  |  |  |  |
Principal amount | $ 859 | 785 |  |  |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (10) | (11) |  |  |  |  |
Long-term debt, net | $ 849 | 774 | $ 779 |  |  |  |
Senior Notes [Member] | 3.375 Senior Notes Due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (percent) | 3.375% |  |  |  |  |  |
Principal amount | $ 300 | 0 |  |  |  |  |
Unamortized Premium (Discount) and Debt Issuance Costs | (4) | 0 |  |  |  |  |
Long-term debt, net | $ 296 | $ 0 |  |  |  |  |

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