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Long-Term Debt and Common Stock (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Abstract] |  |
Proceeds from Debt, Net of Issuance Costs | $ 1,480,000,000 |
Dividends Common Stock Declared Per Share | $ 0.2875 |
Dividends Payable, Amount Per Share After Increase | $ 0.375 |
Commercial Paper [Member] |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 0 | $ 0
Revolving Credit Agreement (New Facility) [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000,000,000.0 |
Line of Credit Facility, Expiration Date | Jun. 27, 2024 |
Revolving Credit Agreement 2020 [Member] |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 0 | $ 0
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% |
Eurodollar [Member] |  |
Line of Credit Facility [Line Items] |  |
Weighted average interest rate (in hundredths) | 1.05% |
Base Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Weighted average interest rate (in hundredths) | 3.25% |
4.40% Senior Notes Due 2020 [Member] |  |
Debt Instrument [Abstract] |  |
Debt Instrument, Face Amount | $ 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.40% |
2.45% Senior Notes Due 2020 [Member] |  |
Debt Instrument [Abstract] |  |
Debt Instrument, Face Amount | $ 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 2.45% |
4.375% Senior Notes Due 2030 [Member] |  |
Debt Instrument [Abstract] |  |
Debt Instrument, Face Amount | $ 750,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.375% |
4.950% Senior Notes Due 2050 [Member] |  |
Debt Instrument [Abstract] |  |
Debt Instrument, Face Amount | $ 750,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.95% |

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