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Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Long-term investments | $ 20,812 | $ 17,314
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Long-term investments | 1,089 | 1,021
Variable Interest Entity, Not Primary Beneficiary | Hedge fund investments |  |
Variable Interest Entity [Line Items] |  |
Long-term investments | 342 | 271
Variable Interest Entity, Not Primary Beneficiary | Private equity investments |  |
Variable Interest Entity [Line Items] |  |
Long-term investments | 547 | 538
Variable Interest Entity, Not Primary Beneficiary | Real estate partnerships |  |
Variable Interest Entity [Line Items] |  |
Long-term investments | $ 200 | $ 212

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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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