Other Investments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jul. 31, 2021	Dec. 31, 2020
Equity Securities without Readily Determinable Fair Value, Amount	$ 2,900		$ 1,700
Convertible Debt Securities | Subsequent Event
Equity Securities without Readily Determinable Fair Value, Amount		$ 415
Other Income [Member]
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	902
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	$ 1,200