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Senior Notes (Narrative) (Details) - Senior Notes [Member] | 12 Months Ended
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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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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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