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Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	$ 185	$ 125	$ 555	$ 19
Net tax effect	(55)	(45)	(170)	(20)
Operating Segments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	165	179	469	272
Net tax effect	(50)	(55)	(145)	(84)
Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Net income	20	(54)	86	(253)
Core Earnings adjustments to GAAP	25	(64)	111	(317)
Net tax effect	(5)	10	(25)	64
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]
Adjustments Required To Reconcile Core Earnings [Line Items]
Core Earnings adjustments to GAAP	30	(59)	121	(306)
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	$ (5)	$ (5)	$ (10)	$ (11)

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