Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	$ 228	$ 645	$ 717
Net income tax effect	(85)	(182)	(219)
Operating Segments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	303	458	551
Net income tax effect	(93)	(122)	(180)
Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	75	(187)	(166)
Core Earnings adjustments to GAAP	83	(247)	(205)
Net income tax effect	(8)	60	39
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Core Earnings adjustments to GAAP	73	(266)	(235)
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Core Earnings adjustments to GAAP	$ 10	$ 19	$ 30