Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	$ 36	$ 66	$ 109	$ 177
Net tax effect	(12)	(30)	(27)	(63)
Operating Segments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	33	88	86	221
Net tax effect	(10)	(28)	(26)	(68)
Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net Income (Loss)	(3)	22	(23)	44
Core Earnings adjustments to GAAP	(5)	20	(24)	49
Net tax effect	2	2	1	(5)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Core Earnings adjustments to GAAP	(8)	17	(29)	44
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	$ 3	$ 3	$ 5	$ 5