Equity Securities Net Gains (Losses) from Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Gains (Losses) from Equity Securities [Line Items]
Total net gains (losses) from equity securities not held for trading	$ 576	$ 392
Not designated as hedging instrument [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains from economic hedge derivatives	3,983	763
Economic hedges [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains from economic hedge derivatives	(150)	106
Net gain (loss) from equity securities [Member] | Economic hedges [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains from economic hedge derivatives	0	425
Equity securities [Member] | Net gain (loss) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total equity securities carried at fair value	(24)	(298)
Marketable equity securities [Member] | Net gain (loss) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total equity securities carried at fair value	(2)	60
Nonmarketable equity securities [Member] | Net gain (loss) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total equity securities carried at fair value	(22)	(358)
Total nonmarketable equity securities not carried at fair value	600	265
Nonmarketable equity securities [Member] | Impairment write-downs [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total nonmarketable equity securities not carried at fair value	(438)	(15)
Nonmarketable equity securities [Member] | Net unrealized gains (losses) [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total nonmarketable equity securities not carried at fair value	690	225
Nonmarketable equity securities [Member] | Net realized gains (losses) on sale [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Total nonmarketable equity securities not carried at fair value	$ 348	$ 55