Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	$ 255	$ 370
Net tax effect	(77)	(114)
Operating Segments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	135	305
Net tax effect	(42)	(93)
Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	120	65
Core Earnings adjustments to GAAP	155	86
Net tax effect	(35)	(21)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Core Earnings adjustments to GAAP	159	91
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	$ (4)	$ (5)