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Debt and Credit Facility (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of Financing Arrangements | The following table summarizes the carrying amount of our borrowings under various financing arrangements (in millions):
|  |  |  |  |  |  |  | December 31,
Type of Borrowing |  | Issue Date |  | Due Date |  | Interest Rate |  | 2017 |  | 2016
Senior Unsecured |  | September 2015 |  | September 2018 |  | 1.85% |  | $ | 999 |  |  | $ | 998 |
Senior Unsecured |  | September 2017 |  | September 2018 |  | 3-month LIBOR + 0.17% |  | 749 |  |  | — |
Term Loan |  | October 2017 |  | October 2018 |  | Variable |  | 999 |  |  | — |
Senior Unsecured |  | September 2017 |  | March 2019 |  | 3-month LIBOR + 0.22% |  | 748 |  |  | — |
Senior Unsecured |  | March 2014 |  | April 2019 |  | 2.05% |  | 499 |  |  | 499 |
Term Loan |  | May 2016 |  | May 2019 |  | Variable |  | — |  |  | 311 |
Senior Unsecured |  | September 2017 |  | September 2019 |  | 1.85% |  | 997 |  |  | — |
Senior Unsecured |  | September 2017 |  | September 2019 |  | 3-month LIBOR + 0.25% |  | 499 |  |  | — |
Senior Unsecured |  | November 2014 |  | February 2020 |  | 2.35% |  | 499 |  |  | 498 |
Senior Unsecured |  | September 2015 |  | September 2020 |  | 2.55% |  | 1,994 |  |  | 1,991 |
Term Loan |  | October 2017 |  | October 2020 |  | Variable |  | 998 |  |  | — |
Senior Unsecured |  | March 2011 |  | April 2021 |  | 4.50% |  | 995 |  |  | 994 |
Senior Unsecured |  | December 2011 |  | December 2021 |  | 4.40% |  | 1,246 |  |  | 1,245 |
Senior Unsecured |  | September 2016 |  | March 2022 |  | 1.95% |  | 497 |  |  | 497 |
Senior Unsecured |  | September 2015 |  | September 2022 |  | 3.25% |  | 996 |  |  | 995 |
Term Loan |  | October 2017 |  | October 2022 |  | Variable |  | 2,497 |  |  | — |
Senior Unsecured |  | September 2016 |  | September 2023 |  | 2.50% |  | 745 |  |  | 744 |
Senior Unsecured |  | March 2014 |  | April 2024 |  | 3.70% |  | 1,742 |  |  | 1,741 |
Senior Unsecured |  | November 2014 |  | February 2025 |  | 3.50% |  | 1,744 |  |  | 1,743 |
Senior Unsecured |  | September 2015 |  | March 2026 |  | 3.65% |  | 2,729 |  |  | 2,726 |
Senior Unsecured |  | September 2016 |  | March 2027 |  | 2.95% |  | 1,244 |  |  | 1,243 |
Senior Unsecured |  | September 2015 |  | September 2035 |  | 4.60% |  | 990 |  |  | 989 |
Senior Unsecured |  | September 2016 |  | September 2036 |  | 4.00% |  | 740 |  |  | 739 |
Senior Unsecured |  | December 2011 |  | December 2041 |  | 5.65% |  | 995 |  |  | 995 |
Senior Unsecured |  | March 2014 |  | April 2044 |  | 4.80% |  | 1,733 |  |  | 1,732 |
Senior Unsecured |  | November 2014 |  | February 2045 |  | 4.50% |  | 1,730 |  |  | 1,729 |
Senior Unsecured |  | September 2015 |  | March 2046 |  | 4.75% |  | 2,215 |  |  | 2,214 |
Senior Unsecured |  | September 2016 |  | March 2047 |  | 4.15% |  | 1,723 |  |  | 1,723 |
Total debt, net |  | 33,542 |  |  | 26,346 |
Less current portion |  | 2,747 |  |  | — |
Total long-term debt, net |  | $ | 30,795 |  |  | $ | 26,346 |
Schedule of Contractual Maturities of Financing Obligations | As of December 31, 2017, the aggregate future principal maturities of financing obligations for each of the next five years, based on contractual due dates, are as follows (in millions):
|  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022
Contractual Maturities |  | $ | 2,750 |  |  | $ | 2,812 |  |  | $ | 3,750 |  |  | $ | 2,500 |  |  | $ | 3,438 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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