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Debt and Lines of Credit | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Debt and lines of credit | Debt and lines of credit Short-term borrowings We maintain a line of credit to support commercial paper borrowings, if any, and to provide additional liquidity through bank loans. As of December 31, 2021, we had a variable-rate revolving credit facility from a consortium of investment-grade banks that allows us to borrow up to $2 billion until March 2024. As of December 31, 2021, our credit facility was undrawn, and we had no commercial paper outstanding. Long-term debt In February 2021, we retired $550 million of maturing debt. In September 2021, we issued three series of senior unsecured notes for an aggregate principal amount of $1.5 billion, consisting of $500 million of 1.125% notes due in 2026, $500 million of 1.90% notes due in 2031 and $500 million of 2.70% notes due in 2051. We incurred $10 million of issuance costs. The proceeds of the offering were $1.5 billion, net of the original issuance discounts, which will be used for general corporate purposes. In March 2020, we issued a principal amount of $750 million of fixed-rate, long-term debt due in 2025. We incurred $4 million of issuance costs. The proceeds of the offering were $749 million, net of the original issuance discount, and were used for general corporate purposes and the repayment of maturing debt. In April 2020, we retired $500 million of maturing debt. In May 2020, we issued a principal amount of $750 million of fixed-rate, long-term debt due in 2030. We incurred $5 million of issuance costs. The proceeds of the offering were $749 million, net of the original issuance discount, and were used for general corporate purposes. In March 2019, we issued a principal amount of $750 million of fixed-rate, long-term debt due in 2039. We incurred $7 million of issuance costs. The proceeds of the offering were $743 million, net of the original issuance discount, and were used for general corporate purposes. In August 2019, we retired $750 million of maturing debt. In September 2019, we issued a principal amount of $750 million of fixed-rate, long-term debt due in 2029. We incurred $5 million of issuance costs. The proceeds of the offering were $748 million, net of the original issuance discount, and were used for general corporate purposes. Long-term debt outstanding is as follows:
| December 31,
| 2021 |  | 2020
Notes due 2021 at 2.75% | $ | — |  |  | $ | 550 |
Notes due 2022 at 1.85% | 500 |  |  | 500 |
Notes due 2023 at 2.25% | 500 |  |  | 500 |
Notes due 2024 at 2.625% | 300 |  |  | 300 |
Notes due 2025 at 1.375% | 750 |  |  | 750 |
Notes due 2026 at 1.125% | 500 |  |  | — |
Notes due 2027 at 2.90% | 500 |  |  | 500 |
Notes due 2029 at 2.25% | 750 |  |  | 750 |
Notes due 2030 at 1.75% | 750 |  |  | 750 |
Notes due 2031 at 1.90% | 500 |  |  | — |
Notes due 2039 at 3.875% | 750 |  |  | 750 |
Notes due 2048 at 4.15% | 1,500 |  |  | 1,500 |
Notes due 2051 at 2.70% | 500 |  |  | — |
Total debt | 7,800 |  |  | 6,850 |
Net unamortized discounts, premiums and issuance costs | (59) |  |  | (52) |
Total debt, including net unamortized discounts, premiums and issuance costs | 7,741 |  |  | 6,798 |
Current portion of long-term debt | (500) |  |  | (550) |
Long-term debt | $ | 7,241 |  |  | $ | 6,248 |
Interest and debt expense was $184 million, $190 million and $170 million in 2021, 2020 and 2019, respectively. This was net of the amortized discounts, premiums and issuance costs. Cash payments for interest on long-term debt were $181 million, $182 million and $156 million in 2021, 2020 and 2019, respectively. Capitalized interest was not material.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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