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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Measured on Non-Recurring Basis) (Details) - Partnership Interest [Member] $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | [1] | Jun. 30, 2019 USD ($) | [1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets Carrying Value Prior To Impairment | $ 5,694 | $ 5,694
Fair Value Assets Gains Losses | $ (5,049) | $ (5,049)
[1] | The impaired limited partnership interests presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.

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- Definition This element represents the carrying reported amount, before impairment, of an asset that is still held as of the reporting date. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition This element represents the difference between the carrying value of the asset before being adjusted to fair value as of the reporting date and its reported estimated fair value as of the reporting date. + References No definition available. + 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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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |