Fair Values (Details Textuals) - Fair Value, Nonrecurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 1,300		$ 1,300		$ 530
Net upward adjustments of equity securities without readily determinable fair values	103	$ 25	728	$ 47
Cumulative net unrealized gains for equity investments without readily determinable fair values	$ 1,100		$ 1,100		$ 347