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