Equity Securities Net Gains (Losses) from Equity Securities Not Held for Trading (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net Gains (Losses) from Equity Securities [Line Items]
Total net gains (losses) from equity securities not held for trading	$ 80	$ (94)	$ 98	$ (451)
Net gains (losses) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from equity securities carried at fair value	49	48	60	10
Marketable equity securities [Member] | Net gains (losses) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from equity securities carried at fair value	42	63	49	26
Nonmarketable equity securities [Member] | Net gains (losses) from equity securities [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from equity securities carried at fair value	7	(15)	11	(16)
Net gains (losses) from nonmarketable equity securities not carried at fair value	31	(142)	38	(461)
Nonmarketable equity securities [Member] | Impairment write-downs [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from nonmarketable equity securities not carried at fair value	(193)	(175)	(390)	(665)
Nonmarketable equity securities [Member] | Net unrealized gains (losses) [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from nonmarketable equity securities not carried at fair value	202	(12)	329	139
Nonmarketable equity securities [Member] | Net realized gains from sale [Member]
Net Gains (Losses) from Equity Securities [Line Items]
Net gains (losses) from nonmarketable equity securities not carried at fair value	$ 22	$ 45	$ 99	$ 65