Other Investments (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount			$ 101
Equity Securities without Readily Determinable Fair Value, Amount	$ 900		900	$ 1,700
Equity Securities without Readily Determinable Fair Value, Amount	900		900	1,700
Equity Securities
Schedule of Equity Method Investments [Line Items]
Marketable Securities, Unrealized Gain (Loss)			$ 8,300	$ 24
Equity Securities | Rivian
Schedule of Equity Method Investments [Line Items]
Marketable Securities, Unrealized Gain (Loss)	$ 8,200
Other Income [Member]
Schedule of Equity Method Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount		$ 902