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Debt - Credit Facilities and Restrictive Covenants (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items] |  |
Current portion of debt | $ 2,558 | $ 2,477
$4 billion credit facility due November 16, 2023 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 4,000 |
Remaining borrowing capacity | $ 3,900 |
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA | 5.50 |
Current portion of debt | $ 0 | 0
Letters of credit outstanding | $ 82 |
$4 billion credit facility due November 16, 2023 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Standby fee rate | 0.10% |
$4 billion credit facility due November 16, 2023 | Maximum |  |
Line of Credit Facility [Line Items] |  |
Standby fee rate | 0.30% |
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Minimum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 0.10% |
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Maximum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.00% |
$4 billion credit facility due November 16, 2023 | London Interbank Offered Rate (LIBOR) | Minimum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.00% |
$4 billion credit facility due November 16, 2023 | London Interbank Offered Rate (LIBOR) | Maximum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 2.00% |
$4 billion credit facility due November 16, 2023 | Federal Funds Rate |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 0.50% |
$4 billion credit facility due November 16, 2023 | Eurodollar |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.00% |
Commercial Paper |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 4,000 |
Debt term | 270 days |
Current portion of debt | $ 0 | $ 37

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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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