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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Measurements |
Fair Value, Assets and Liabilities Measured on Recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements
Description | ​ | Fair Value at | ​ | Using Inputs Considered as
(Millions) |  | June 30, 2021 |  | Level 1 |  | Level 2 |  | Level 3
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 7 | ​ | $ | — | ​ | $ | 7 | ​ | $ | —
Commercial paper | ​ | ​ | 502 | ​ | ​ | — | ​ | ​ | 502 | ​ | ​ | —
Certificates of deposit/time deposits | ​ |  | 13 | ​ |  | — | ​ |  | 13 | ​ |  | —
U.S. treasury securities | ​ |  | 280 | ​ |  | 280 | ​ |  | — | ​ |  | —
U.S. municipal securities | ​ |  | 34 | ​ |  | — | ​ |  | — | ​ |  | 34
Derivative instruments — assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency forward/option contracts | ​ |  | 68 | ​ |  | — | ​ |  | 68 | ​ |  | —
Interest rate contracts | ​ |  | 7 | ​ |  | — | ​ |  | 7 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative instruments — liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency forward/option contracts | ​ |  | 72 | ​ |  | — | ​ |  | 72 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements
Description | ​ | Fair Value at | ​ | Using Inputs Considered as
(Millions) |  | December 31, 2020 |  | Level 1 |  | Level 2 |  | Level 3
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 7 | ​ | $ | — | ​ | $ | 7 | ​ | $ | —
Commercial paper | ​ | ​ | 237 | ​ | ​ | — | ​ | ​ | 237 | ​ | ​ | —
Certificates of deposit/time deposits | ​ |  | 31 | ​ |  | — | ​ |  | 31 | ​ |  | —
U.S. treasury securities | ​ |  | 125 | ​ |  | 125 | ​ |  | — | ​ |  | —
U.S. municipal securities | ​ |  | 34 | ​ |  | — | ​ |  | — | ​ |  | 34
Derivative instruments — assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency forward/option contracts | ​ |  | 37 | ​ |  | — | ​ |  | 37 | ​ |  | —
Interest rate contracts | ​ |  | 7 | ​ |  | — | ​ |  | 7 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative instruments — liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency forward/option contracts | ​ |  | 106 | ​ |  | — | ​ |  | 106 | ​ |  | —
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended
Marketable securities — certain U.S. municipal securities only | ​ | June 30, | ​ | June 30,
(Millions) | ​ | 2021 |  | 2020 | ​ | 2021 |  | 2020
Beginning balance | ​ | $ | 34 | ​ | $ | 37 | ​ | $ | 34 | ​ | $ | 46
Total gains or losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Included in earnings | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Included in other comprehensive income | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Purchases and issuances | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 10
Sales and settlements | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (19)
Transfers in and/or out of level 3 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Ending balance | ​ | $ | 34 | ​ | $ | 37 | ​ | $ | 34 | ​ | $ | 37
Change in unrealized gains or losses for the period included in earnings for securities held at the end of the reporting period | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Fair Value of Financial Instruments by Balance Sheet Grouping | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ |  | Carrying |  | Fair |  | Carrying |  | Fair
(Millions) | ​ | Value | ​ | Value | ​ | Value | ​ | Value
Long-term debt, excluding current portion | ​ | $ | 16,267 | ​ | $ | 18,118 | ​ | $ | 17,989 | ​ | $ | 20,496

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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