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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of outstanding debt | The following is a summary of outstanding debt (in millions):
As of December 31 | 2017 |  | 2016
3.875% Senior Notes due December 2025 | $ | 745 |  |  | $ | 744 |
5.00% Senior Notes due September 2020 | 598 |  |  | 598 |
3.50% Senior Notes due June 2024 | 595 |  |  | 594 |
4.75% Senior Notes due May 2045 | 592 |  |  | 592 |
2.875% Senior Notes due May 2026 (EUR 500M) | 587 |  |  | 516 |
4.60% Senior Notes due June 2044 | 544 |  |  | 543 |
8.205% Junior Subordinated Notes due January 2027 | 521 |  |  | 521 |
2.80% Senior Notes due March 2021 | 398 |  |  | 397 |
4.00% Senior Notes due November 2023 | 348 |  |  | 347 |
6.25% Senior Notes due September 2040 | 296 |  |  | 295 |
4.76% Senior Notes due March 2018 (CAD 375M) | 296 |  |  | 277 |
4.45% Senior Notes due May 2043 | 246 |  |  | 246 |
4.25% Senior Notes due December 2042 | 197 |  |  | 197 |
Commercial paper | — |  |  | 329 |
Other | 3 |  |  | 9 |
Total debt | 5,966 |  |  | 6,205 |
Less: Short-term and current portion of long-term debt | 299 |  |  | 336 |
Total long-term debt | $ | 5,667 |  |  | $ | 5,869 |
Repayments of long-term debt | Repayments of total debt are as follows (in millions):
2018 | $ | 299 |
2019 | — |
2020 | 600 |
2021 | 400 |
2022 | — |
Thereafter | 4,770 |
Total Repayments | 6,069 |
Unamortized discount, premium, and debt issuance cost | (103 | )
Total Debt | $ | 5,966 |
Schedule of Commercial Paper | The weighted average commercial paper outstanding and its related interest rates are as follows:
Years ended December 31 |  | 2017 |  | 2016
Weighted average commercial paper outstanding |  | $ | 170 |  |  | $ | 265 |
Weighted average interest rate of commercial paper outstanding |  | 0.18 | % |  | 0.22 | %
Commercial paper outstanding, which is included in Short-term debt and current portion of long-term debt in the Company’s Consolidated Statements of Financial Position, is as follows (in millions):
As of |  | December 31, 2017 |  | December 31, 2016
Commercial paper outstanding |  | $ | — |  |  | $ | 329 |

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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=84159872&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=75038535&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=84159872&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=84159872&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=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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