Derivatives, Gains (Losses) Recognized on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Line Items Presented in the Consolidated Statement of Income and Other Comprehensive Income [Abstract]
Loans	$ 7,218	$ 7,201
Other interest income	90	65
Long-term debt	(761)	(1,026)
Total recorded in OCI, Derivative gains (losses)	27	47
Cash flow hedging [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	14	53
Net unrealized gains (losses) (pre-tax) recognized in OCI	(51)	(31)
Total gains (losses) (pre-tax) recognized on cash flow hedges	(37)	22
Cash flow hedging [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	12	52
Net unrealized gains (losses) (pre-tax) recognized in OCI	(48)	(20)
Total gains (losses) (pre-tax) recognized on cash flow hedges	(36)	32
Cash flow hedging [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	2	1
Net unrealized gains (losses) (pre-tax) recognized in OCI	(3)	(11)
Total gains (losses) (pre-tax) recognized on cash flow hedges	(1)	(10)
Cash flow hedging [Member] \| Loans [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gains (losses) (pre-tax) on interest rate contracts	(16)	(52)
Cash flow hedging [Member] \| Loans [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(16)	(52)
Total gains (losses) (pre-tax) on interest rate contracts	(16)	(52)
Cash flow hedging [Member] \| Loans [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0
Cash flow hedging [Member] \| Other interest income [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gains (losses) (pre-tax) on interest rate contracts	4	0
Cash flow hedging [Member] \| Other interest income [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	4	0
Total gains (losses) (pre-tax) on interest rate contracts	4	0
Cash flow hedging [Member] \| Other interest income [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0
Cash flow hedging [Member] \| Long-term debt [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gains (losses) (pre-tax) on interest rate contracts	(2)	(1)
Cash flow hedging [Member] \| Long-term debt [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0
Cash flow hedging [Member] \| Long-term debt [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(2)	(1)
Total gains (losses) (pre-tax) on interest rate contracts	(2)	(1)
Cash flow hedging [Member] \| Derivative gains (losses) [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gains (losses) (pre-tax) on interest rate contracts	(14)	(53)
Cash flow hedging [Member] \| Derivative gains (losses) [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(12)	(52)
Total gains (losses) (pre-tax) on interest rate contracts	(12)	(52)
Cash flow hedging [Member] \| Derivative gains (losses) [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(2)	(1)
Total gains (losses) (pre-tax) on interest rate contracts	$ (2)	$ (1)

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Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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