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Debt Obligations (Tables) | 3 Months Ended
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Mar. 31, 2017
Debt Disclosure [Abstract] |
Changes in Debt Obligations | The following table presents the changes in the carrying amount of our debt obligations during the three months ended March 31, 2017:
| December 31, 2016 |  | Additions |  | Payments, Accretion and Other |  | March 31, 2017
| (in millions)
5.55% senior unsecured notes due January 15, 2020 | $ | 598 |  |  | $ | — |  |  | $ | — |  |  | $ | 598 |
5.25% senior unsecured notes due January 16, 2018 | 369 |  |  | — |  |  | — |  |  | 369 |
3.875% senior unsecured notes due June 7, 2021 | 625 |  |  | — |  |  | 8 |  |  | 633 |
4.25% senior unsecured notes due June 1, 2024 | 495 |  |  | — |  |  | 1 |  |  | 496 |
1.75% senior unsecured notes due May 19, 2023 | 622 |  |  | — |  |  | 9 |  |  | 631 |
3.85% senior unsecured notes due June 30, 2026 | 495 |  |  | — |  |  | — |  |  | 495 |
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 2.28% for the period January 1, 2017 through March 31, 2017) | 399 |  |  | — |  |  | — |  |  | 399 |
$750 million revolving credit commitment due November 25, 2019 (average interest rate of 0.00% for the period January 1, 2017 through March 31, 2017) | — |  |  | — |  |  | — |  |  | — |
Total debt obligations | 3,603 |  |  | — |  |  | 18 |  |  | 3,621 |
Less current portion | — |  |  | — |  |  | — |  |  | (379 | )
Total long-term debt obligations | $ | 3,603 |  |  | $ | — |  |  | $ | 18 |  |  | $ | 3,242 |

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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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