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Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from VIE | $ 183 | $ 183 | $ 183 |
Long-term investments | 21,096 | $ 23,025 |  |
Red Oak |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE, ownership percentage |  |  |  | 50.00%
Initial contractual term (in years) |  |  |  | 10 years
Amended contract extension term |  | 5 years |  |
Amended contract term (in years) |  | 15 years |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Long-term investments | 1,537 | $ 1,289 |  |
Variable Interest Entity, Not Primary Beneficiary | Hedge fund investments |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Long-term investments | 589 | 463 |  |
Variable Interest Entity, Not Primary Beneficiary | Private equity investments |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Long-term investments | 707 | 601 |  |
Variable Interest Entity, Not Primary Beneficiary | Real estate partnerships |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Long-term investments | $ 241 | $ 225 |  |

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- Definition Variable Interest Entity, Initial Contractual Term + References No definition available. + Details
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- Definition Variable Interest Entity, Amended Contract Extension Term + References No definition available. + Details
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- Definition Variable Interest Entity, Amended Contract 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685 + Details
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- Details
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