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Credit Facilities and Restrictive Covenants (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |
Current portion of debt | $ 2,477 | $ 3,388
$500 million, 364-day credit facility expired November 15, 2019 |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 500
Debt Instrument, Term |  | 364 days
$4 billion credit facility due November 16, 2023 |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | $ 4,000 |
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA | 5.50 |
Letters of Credit Outstanding, Amount | $ 84 |
Remaining borrowing capacity | $ 3,900 |
$4 billion credit facility due November 16, 2023 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.10% |
$4 billion credit facility due November 16, 2023 | Maximum |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.30% |
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, 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] |  |
Debt Instrument, 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] |  |
Debt Instrument, 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] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |
$4 billion credit facility due November 16, 2023 | Federal Funds Rate |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |
$4 billion credit facility due November 16, 2023 | Eurodollar |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |
Commercial Paper |  |
Line of Credit Facility [Line Items] |  |
Commercial Paper, Maximum Borrowing Capacity | $ 4,000 |
Debt Instrument, Term | 270 days |
Current portion of debt | $ 37 | $ 433

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