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Long-Term Debt 2018 Private Offering of Senior Notes (Details) - USD ($) $ in Millions | Jun. 30, 2020 | May 01, 2020
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Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.875%
Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50%
Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875%
Senior Notes [Member] | Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage | 5.875% |
Senior Notes [Member] | Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | 800
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |
Senior Notes [Member] | Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | $ 1,000
Debt Instrument, Interest Rate, Stated Percentage | 4.85% |

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