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Debt And Related Expenses (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Redemption of senior notes |  |  | $ 162,000,000 | $ 807,000,000 |
Loss on early retirement of debt |  |  |  | (312,000,000) |
Loss on early retirement of debt, cash retirement costs |  |  |  | $ 304,000,000 |
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption of senior notes |  | $ 807,000,000 |  |  |
Loss on early retirement of debt |  | (312,000,000) |  |  |
Loss on early retirement of debt, cash retirement costs |  | 304,000,000 |  |  |
Loss on early retirement of debt, noncash charges |  | 8,000,000 |  |  |
6.30% Due January 15, 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate, stated percentage |  |  | 6.30% |  | 6.30%
Debt, maturity date |  |  | Jan. 15, 2019 |  |
6.30% Due January 15, 2019 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption of senior notes | $ 162,000,000 |  |  |  |
Debt interest rate, stated percentage | 6.30% |  |  |  |
7.875% due September 30, 2031 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate, stated percentage |  |  | 7.875% |  | 7.875%
Debt, maturity date |  |  | Sep. 30, 2031 |  |
7.875% due September 30, 2031 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption of senior notes |  | $ 384,000,000 |  |  |
Debt interest rate, stated percentage |  | 7.875% |  |  |
Debt, maturity date |  | Sep. 30, 2031 |  |  |
7.95% due April 15, 2032 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate, stated percentage |  |  | 7.95% |  | 7.95%
Debt, maturity date |  |  | Apr. 15, 2032 |  |
7.95% due April 15, 2032 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption of senior notes |  | $ 423,000,000 |  |  |
Debt interest rate, stated percentage |  | 7.95% |  |  |
Debt, maturity date |  | Apr. 15, 2032 |  |  |
Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit Facility, borrowing capacity |  |  | $ 3,000,000,000.0 |  |
Outstanding credit facility borrowings |  |  | $ 0 |  |
Debt-to-capitalization ratio |  |  | 0.234 |  |
Outstanding letters of credit |  |  | $ 3,000,000 |  |
Senior Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt-to-capitalization ratio |  |  | 0.65 |  |

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