Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - Other Assets and Other Liabilities [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (46)	$ 6	$ 43
Total gains realized/unrealized:
Included in earnings	$ 36	$ (34)	$ 126
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenue from Contract with Customer, Including Assessed Tax	Revenue from Contract with Customer, Including Assessed Tax	Revenue from Contract with Customer, Including Assessed Tax
Transfers out of Level 3	$ (7)	$ (18)	$ (163)
Ending Balance	(17)	(46)	6
Changes in net unrealized gains (losses) included in earnings related to assets/ instruments still held at end of period	$ 15	$ (46)	$ 9