Other Investments Other Investments (Details) - USD ($)	3 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Other Investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount	$ 1,700,000,000	$ 1,200,000,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration