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Senior Notes (Narrative) (Details) - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2020 USD ($)
4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 05, 2014
Debt instrument face amount	$ 400,000,000
Debt instrument, term	30 years
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 01, 2044
3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 07, 2020
Debt instrument face amount	$ 1,000,000,000
Debt instrument, term	30 years
Debt instrument, stated interest rate	3.50%
Debt instrument, maturity date	Oct. 15, 2050

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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