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Debt and Credit Agreements - Activity Related to Long-Term Debt (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Movement, Debt Instruments [Roll Forward] |  |
Long-term debt as of December 31, 2018, Current Portion | $ 18 |
Long-term debt as of December 31, 2018, Long-term Portion | 14,739 |
Long-term debt as of December 31, 2018, Total | 14,757 |
Long-term debt issued | 1,000 | $ 2,000
Reclassifications | 0 |
Discount, premium and other activity | 10 |
Long-term debt as of June 30, 2019, Current Portion | 245 |
Long-term debt as of June 30, 2019, Long-term Portion | 15,522 |
Long-term debt as of June 30, 2019, Total | 15,767 |
Current Portion |  |
Movement, Debt Instruments [Roll Forward] |  |
Long-term debt as of December 31, 2018, Current Portion | 18 |
Long-term debt issued | 0 |
Reclassifications | 227 |
Discount, premium and other activity | 0 |
Long-term debt as of June 30, 2019, Current Portion | 245 |
Long-term Portion |  |
Movement, Debt Instruments [Roll Forward] |  |
Long-term debt as of December 31, 2018, Long-term Portion | 14,739 |
Long-term debt issued | 1,000 |
Reclassifications | (227) |
Discount, premium and other activity | 10 |
Long-term debt as of June 30, 2019, Long-term Portion | $ 15,522 |

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- Definition Reclassification of Debt, Long Term Debt to Short Term Debt + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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