Fair Values (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net upward adjustments of equity securities without readily determinable fair values	$ 248	$ 7	$ 625	$ 22
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	1,200		1,200		$ 530
Net upward adjustments of equity securities without readily determinable fair values	248	$ 7	625	$ 22
Cumulative net unrealized gains for equity investments without readily determinable fair values	$ 977		$ 977		$ 347