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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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Amount specified in the debt agreement of the maximum debt-to-total capitalization level which the entity is allowed to reach without impacting the entity's ability to borrow under the agreement.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate of short-term debt outstanding calculated over time.

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