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Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |
Initial contractual term (in years) | 10 years |  |
Long-term investments |  | $ 15,732 | $ 112
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term investments |  | 1,069 |
Hedge fund investments | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term investments |  | 270 |
Private equity investments | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term investments |  | 524 |
Real estate partnerships | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term investments |  | $ 275 |

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- Definition Variable Interest Entity, Initial Contractual Term + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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