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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments |
Schedule of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
(in millions) | ​ | June 30, 2022 | ​ | December 31, 2021
Equity investments | ​ | $ | 22 | ​ | $ | 16
Equity method investments | ​ | ​ | 109 | ​ | ​ | 104
Marketable securities | ​ | ​ | 4 | ​ | ​ | 12
Total investments | ​ | $ | 135 | ​ | $ | 132

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI https://asc.fasb.org/topic&trid=2197064 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI https://asc.fasb.org/topic&trid=75115024 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI https://asc.fasb.org/topic&trid=2196965 + Details
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