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Fair Value Measurements Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Investments, Fair Value Adjustment | $ 48
Real Estate Segment |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Other Asset Impairment Charges | 5
Impairment of Long-Lived Assets Held-for-use | $ 2

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