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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net unrealized derivative instrument losses arising during the periods, tax	$ 33	$ 35	$ (11)
Reclassification adjustment for net derivative losses (gains) included in net income, tax	(38)	14	10
Net unrealized debt securities losses arising during the periods, tax	124	165	(79)
Other-than-temporary impairment not recognized in earnings on debt securities, tax	0	0	(1)
Reclassification of net debt securities gains to net income, tax	(1)	(8)	(4)
Actuarial (loss) gain, tax	(10)	12	(14)
Amortization of actuarial loss, tax	4	6	3
Amortization of prior service credit, tax	$ 0	$ 0	$ 0

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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