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Long-Term Debt and Available Credit Facilities Available Committed Credit Facilities (Narrative) (Details) $ in Millions | 36 Months Ended | 37 Months Ended | 60 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2021 | Mar. 31, 2019 | Nov. 13, 2023 | Dec. 31, 2020 USD ($) | Nov. 13, 2018 USD ($) | Mar. 22, 2016 USD ($) | May 31, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 6,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 6,000 |  |  |
Revolving Credit Facilities due 2024 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 3,000 | $ 3,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 3,000 |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |
Revolving Credit Facilities due 2022 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 3,000 | $ 3,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 3,000 |  |  |
Debt Instrument, Term | 3 years |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 3,000
Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 4,500 |
Debt Instrument, Term |  | 3 years |  |  |  |  |
Revolving Credit Facilities due 2022 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  |  |  | 0.60 |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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