Derivatives, Gains (Losses) Recognized on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Total amounts presented in the consolidated statement of income and other comprehensive income
Loans	$ 10,065	$ 11,354
Long-term debt	(1,240)	(1,927)
Total recorded in OCI, derivative gains (losses)	182	44
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net losses to net income on cash flow hedges, before tax	58	79
Cash flow hedging [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net losses to net income on cash flow hedges, before tax	58	79
Net unrealized gains (losses) (pre-tax) recognized in OCI	(20)	(9)
Total gains (losses) (pre-tax) recognized on cash flow hedges	38	70
Cash flow hedging [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net losses to net income on cash flow hedges, before tax	56	78
Net unrealized gains (losses) (pre-tax) recognized in OCI	0	0
Total gains (losses) (pre-tax) recognized on cash flow hedges	56	78
Cash flow hedging [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net losses to net income on cash flow hedges, before tax	2	1
Net unrealized gains (losses) (pre-tax) recognized in OCI	(20)
Total gains (losses) (pre-tax) recognized on cash flow hedges	(18)	(8)
Cash flow hedging [Member] \| Loans [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Net unrealized gains (losses) (pre-tax) recognized in OCI	(56)	(78)
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	(56)	(78)
Net unrealized gains (losses) (pre-tax) recognized in OCI	(56)	(78)
Cash flow hedging [Member] \| Loans [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Net unrealized gains (losses) (pre-tax) recognized in OCI	0	0
Cash flow hedging [Member] \| Long-term debt [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Net unrealized gains (losses) (pre-tax) recognized in OCI	(2)	(1)
Cash flow hedging [Member] \| Long-term debt [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Net unrealized gains (losses) (pre-tax) recognized in OCI	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)
Net unrealized gains (losses) (pre-tax) recognized in OCI	(2)	(1)
Cash flow hedging [Member] \| Derivative gains (losses) [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Net unrealized gains (losses) (pre-tax) recognized in OCI	(58)	(79)
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	(56)	(78)
Net unrealized gains (losses) (pre-tax) recognized in OCI	(56)	(78)
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)
Net unrealized gains (losses) (pre-tax) recognized in OCI	$ (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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