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v3.21.1

Long-Term Debt and Common Stock (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 06, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Instrument [Abstract] |  |  |  |
Common Stock Dividends Declared (in dollars per share) | $ 1.00 | $ 0.4125 | $ 0.375 | $ 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) |  | 1.01% |  |
Base Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted average interest rate (in hundredths) |  | 3.25% |  |
2.45% Senior Notes Due 2020 [Member] |  |  |  |
Debt Instrument [Abstract] |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.10% |  |

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