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Investments (Tables) | 3 Months Ended
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Mar. 31, 2021
Investment Segment |
Schedule of Investments [Line Items] |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Assets | ​ | ​ | ​ | ​ | ​ | ​
Investments: |  | ​ |  |  | ​ |
Equity securities: |  | ​ |  |  | ​ |
Consumer, non-cyclical | ​ | $ | 2,079 | ​ | $ | 1,548
Consumer, cyclical | ​ |  | 2,572 | ​ |  | 2,073
Energy | ​ |  | 3,703 | ​ |  | 2,654
Utilities | ​ |  | 658 | ​ |  | 107
Technology | ​ |  | 1,589 | ​ |  | 1,578
Industrial | ​ |  | 194 | ​ |  | 158
​ | ​ |  | 10,795 | ​ |  | 8,118
Corporate debt securities | ​ |  | 131 | ​ |  | 121
​ | ​ | $ | 10,926 | ​ | $ | 8,239
Liabilities | ​ |  |  | ​ |  |
Securities sold, not yet purchased, at fair value: | ​ |  |  | ​ |  |
Equity securities: | ​ |  |  | ​ |  |
Consumer, non-cyclical | ​ | $ | 971 | ​ | $ | 424
Consumer, cyclical | ​ |  | 405 | ​ |  | 572
Energy | ​ |  | 3,091 | ​ |  | 1,476
Utilities | ​ |  | 396 | ​ |  | 49
​ | ​ | $ | 4,863 | ​ | $ | 2,521
Other Segments and Holding Company |
Schedule of Investments [Line Items] |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Equity method investments | ​ | $ | 108 | ​ | $ | 120
Held to maturity debt investments measured at amortized cost | ​ | ​ | 20 | ​ | ​ | 20
Other investments measured at fair value | ​ |  | 426 | ​ |  | 534
​ | ​ | $ | 554 | ​ | $ | 674

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