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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal Amount | $ 3,620 | $ 3,620
Unamortized Premium (Discount) and Debt Issuance Costs | (52) | (54)
Net, Long-term Debt | 3,568 | 3,566
Long-term Debt, Current Maturities | (21) | 0
Debt Instrument Unamortized Discount Premium and Debt Issuance Cost Net Excluding Current Maturities | (52) | (54)
Long term Debt Gross Excluding Current Maturities | 3,599 | 3,620
Long-term debt, net | $ 3,547 | 3,566
Line of Credit | 8.73% Senior Notes Due 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 8.73% |
Senior Notes | 3.60% Senior Notes Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 250 | 250
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | (1)
Net, Long-term Debt | $ 250 | 249
Stated interest rate (percent) | 3.60% |
Senior Notes | 3.6% Senior Notes Due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 750 | 750
Unamortized Premium (Discount) and Debt Issuance Costs | (6) | (6)
Net, Long-term Debt | $ 744 | 744
Stated interest rate (percent) | 3.60% |
Senior Notes | 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
Net, Long-term Debt | 11 | 11
Senior Notes | 1.625% Senior Notes Due 2029 |  |
Debt Instrument [Line Items] |  |
Principal Amount | 821 | 859
Unamortized Premium (Discount) and Debt Issuance Costs | (10) | (10)
Net, Long-term Debt | $ 811 | 849
Stated interest rate (percent) | 1.625% |
Senior Notes | 3.375% Senior Notes Due 2030 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 300 | 300
Unamortized Premium (Discount) and Debt Issuance Costs | (4) | (4)
Net, Long-term Debt | $ 296 | 296
Stated interest rate (percent) | 3.375% |
Senior Notes | 3.50% Senior Notes Due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 250 | 250
Unamortized Premium (Discount) and Debt Issuance Costs | (1) | (1)
Net, Long-term Debt | $ 249 | 249
Stated interest rate (percent) | 3.50% |
Senior Notes | 5.0% Senior Notes Due 2046 [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 700 | 700
Unamortized Premium (Discount) and Debt Issuance Costs | (22) | (23)
Net, Long-term Debt | $ 678 | 677
Stated interest rate (percent) | 5.00% |
Senior Notes | 4.375% Senior Notes Due 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 500 | 500
Unamortized Premium (Discount) and Debt Issuance Costs | (9) | (9)
Net, Long-term Debt | $ 491 | 491
Stated interest rate (percent) | 4.375% |
Senior Notes | 8.73% Senior Notes Due 2022 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 34 | 0
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | 0
Net, Long-term Debt | 34 | 0
Debt Instrument Unamortized Discount Premium and debt issuance cost net Current Maturities | 0 | 0
Long Term Debt Gross Current Maturities | $ (21) | 0
Stated interest rate (percent) | 8.73% |
Senior Notes | Term Loan Due Twenty Twenty Six |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 4 | 0
Unamortized Premium (Discount) and Debt Issuance Costs | 0 | 0
Net, Long-term Debt | $ 4 | $ 0
Stated interest rate (percent) | 0.20% |

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