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Debt and Lines of Credit - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt, gross | $ 5,100 |  | $ 4,100
Net unamortized discounts, premiums and debt issuance costs | (33) |  | (23)
Total debt, including net unamortized discounts, premiums and debt issuance costs | 5,067 |  | 4,077
Current portion of long-term debt | (749) |  | (500)
Long-term debt | 4,318 |  | 3,577
Notes due 2018 at 1.00% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 0 |  | 500
Notes due 2019 at 1.65% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 750 |  | 750
Notes due 2020 at 1.75% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 500 |  | 500
Notes due 2021 at 2.75% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 550 |  | 550
Notes due 2022 at 1.85% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 500 |  | 500
Notes due 2023 at 2.25% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 500 |  | 500
Notes due 2024 at 2.625% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 300 |  | 300
Notes due 2027 at 2.90% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | 500 |  | 500
Notes due 2048 at 4.15% |  |  |
Debt Instrument [Line Items] |  |  |
Debt, gross | $ 1,500 | $ 1,500 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 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 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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