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Debt and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Subtotal Long-term Debt (including current portion) | $ 14,757 | $ 11,809
Less Debt Due within One Year | (18) | (19)
Long-term Debt (excluding current portion) | $ 14,739 | 11,790
Notes |  |
Debt Instrument [Line Items] |  |
Average Interest Rates at December | 4.50% |
Subtotal Long-term Debt (including current portion) | $ 14,558 | 11,591
Equipment Obligations |  |
Debt Instrument [Line Items] |  |
Average Interest Rates at December | 6.30% |
Subtotal Long-term Debt (including current portion) | $ 195 | 213
Capital Leases |  |
Debt Instrument [Line Items] |  |
Average Interest Rates at December | 16.20% |
Subtotal Long-term Debt (including current portion) | $ 4 | $ 5

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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