Fair Values (Details Textuals) - Fair Value, Nonrecurring - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value for impairment	$ 0		$ 0
Carrying value of equity securities without readily determinable fair values	1,300,000,000		1,300,000,000
Net upward adjustments of equity securities without readily determinable fair values	12,000,000	$ 378,000,000
Net downward adjustments of equity securities without readily determinable fair values	18,000,000	$ 1,000,000
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,100,000,000		1,100,000,000
Cumulative net unrealized losses for equity investments without readily determinable fair values	$ 29,000,000		$ 10,000,000