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Financing Arrangements (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Aug. 19, 2021 | Nov. 18, 2016
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,500,000,000 | $ 2,500,000,000 | $ 2,200,000,000
Debt Instrument, Covenant, Consolidated Capitalization Ratio, Maximum | 1.0 |  |
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum | 3.0 |  |
Minimum Amount Of Debt Default On Single Instrument To Trigger Cross Default On Line Of Credit Facility | 100,000,000 |  |
Long-term debt, prepayment | 450,000,000 |  |
Letters of Credit Outstanding, Amount | 10,900,000 |  |
Debt Instrument, Covenant, Consolidated Capitalization Ratio, Minimum | 0.65 |  |
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum | $ 1.0 |  |
Senior Notes | Senior Notes Due2021 Member |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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