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Long-Term Debt and Common Stock (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Abstract] |  |  |  |
Debt Instrument, Face Amount | $ 900,000,000 | $ 900,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.625% | 5.625% |  |
Dividends Common Stock Declared Per Share | $ 0.22 |  |  |
Dividends Payable, Amount Per Share After Increase | $ 0.2875 |  |  |
Commercial Paper [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings Outstanding |  | $ 0 |  |
Average Borrowings Outstanding |  |  | $ 11,000,000 |
Weighted average interest rate (in hundredths) |  |  | 1.97% |
Uncommitted Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings Outstanding |  |  |  | $ 0
Revolving Credit Agreement (New Facility) [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings Outstanding |  | 0 |  |
Letters of Credit Outstanding | $ 0 | 0 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000,000,000.0 | $ 2,000,000,000.0 |  |
Line of Credit Facility, Expiration Date |  | Jun. 27, 2024 |  |
Line Of Credit Facility Increase Additional Borrowings |  | $ 3,000,000,000.0 |  |
Maximum Total Debt To Total Capitalization Ratio Allowed Under Financial Covenant | 65.00% | 65.00% |  |
Revolving Credit Agreement 2020 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings Outstanding |  | $ 0 |  | 0
Letters of Credit Outstanding | $ 0 | 0 |  | $ 0
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000,000,000.0 | $ 2,000,000,000.0 |  |
Line of Credit Facility, Expiration Date |  | Jul. 21, 2020 |  |
Eurodollar [Member] | Revolving Credit Agreement (New Facility) [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted average interest rate (in hundredths) |  | 2.92% |  |
Base Rate [Member] | Revolving Credit Agreement (New Facility) [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted average interest rate (in hundredths) |  | 5.00% |  |

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