Fair Values (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value for impairment	$ 3,181,000,000	$ 22,260,000,000
Fair Value, Measurements, Nonrecurring
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	530,000,000
Net upward adjustments of equity securities without readily determinable fair values	727,000,000	93,000,000	$ 80,000,000
Cumulative net unrealized gains for equity investments without readily determinable fair values	$ 1,100,000,000	$ 347,000,000