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Debt and Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Long-term Debt, Unclassified [Abstract] |
Maturities Of Long-Term Debt Disclosures |
Summary of Total Debt |  |  |  |
Senior unsecured notes: |  |  |  |
| Rate |  | Due |  | 2020 |  | 2019
| 4.375% |  | January 15, 2020 | $ | — |  |  | $ | 500 |
| Variable |  | November 30, 2020 | — |  |  | 333 |
| 2.625% |  | March 15, 2021 | 750 |  |  | 749 |
| 1.125% |  | November 30, 2023 | 668 |  |  | 609 |
| 0.600% |  | December 1, 2023 | 597 |  |  | — |
| 3.375% |  | May 15, 2024 | 590 |  |  | 587 |
| 0.250% |  | December 3, 2024 | 1,030 |  |  | 938 |
| 1.150% |  | June 15, 2025 | 644 |  |  | — |
| 3.375% |  | November 1, 2025 | 747 |  |  | 746 |
| 3.500% |  | March 15, 2026 | 992 |  |  | 991 |
| 2.125% |  | November 30, 2027 | 909 |  |  | 829 |
| 3.650% |  | March 7, 2028 | 596 |  |  | 596 |
| 0.750% |  | March 1, 2029 | 969 |  |  | 884 |
| 1.950% |  | June 15, 2030 | 989 |  |  | — |
| 2.625% |  | November 30, 2030 | 782 |  |  | 712 |
| 1.000% |  | December 3, 2031 | 903 |  |  | 823 |
| 4.100% |  | April 1, 2043 | 392 |  |  | 391 |
| 4.375% |  | May 15, 2044 | 395 |  |  | 395 |
| 4.625% |  | March 15, 2046 | 981 |  |  | 981 |
| 2.900% |  | June 15, 2050 | 641 |  |  | — |
Term loan |  | 400 |  |  | — |
Other |  | 16 |  |  | 26 |
Total debt |  | $ | 13,991 |  |  | $ | 11,090 |
Less current maturities |  | 761 |  |  | 859 |
Total long-term debt |  | $ | 13,230 |  |  | $ | 10,231 |
Unamortized debt issuance costs | $ | 71 |  |  | $ | 58 |
Borrowing capacity on existing facilities | $ | 2,903 |  |  | $ | 1,546 |
Fair value of senior unsecured notes | $ | 15,022 |  |  | $ | 11,910 |

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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://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=120391452&loc=d3e13212-122682 Reference 2: 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=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -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 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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