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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 265,809	$ 245,899	$ 254,473
PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	126	135
Commercial Banking
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 74,508	$ 70,333
Percentage of portfolio	100.00%	100.00%
Commercial Banking | PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 31	$ 130
Percentage of portfolio	0.00%	0.20%
Commercial Banking | Noncriticized
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 71,848	$ 68,043
Percentage of portfolio	96.50%	96.80%
Commercial Banking | Criticized | Criticized performing
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 2,181	$ 1,848
Percentage of portfolio	2.90%	2.60%
Commercial Banking | Criticized | Criticized nonperforming
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 448	$ 312
Percentage of portfolio	0.60%	0.40%
Commercial Banking | Commercial and multifamily real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 30,245	$ 28,899
Percentage of portfolio	100.00%	100.00%
Commercial Banking | Commercial and multifamily real estate | PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21	$ 22
Percentage of portfolio	0.10%	0.10%
Commercial Banking | Commercial and multifamily real estate | Noncriticized
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 29,625	$ 28,239
Percentage of portfolio	97.90%	97.70%
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 561	$ 555
Percentage of portfolio	1.90%	1.90%
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 38	$ 83
Percentage of portfolio	0.10%	0.30%
Commercial Banking | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 44,263	$ 41,091
Percentage of portfolio	100.00%	100.00%
Commercial Banking | Commercial and industrial | PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 10	$ 108
Percentage of portfolio	0.00%	0.30%
Commercial Banking | Commercial and industrial | Noncriticized
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 42,223	$ 39,468
Percentage of portfolio	95.40%	96.10%
Commercial Banking | Commercial and industrial | Criticized | Criticized performing
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,620	$ 1,292
Percentage of portfolio	3.70%	3.10%
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 410	$ 223
Percentage of portfolio	0.90%	0.50%
Commercial Banking | Small-ticket commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 343
Percentage of portfolio		100.00%
Commercial Banking | Small-ticket commercial real estate | PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 0
Percentage of portfolio		0.00%
Commercial Banking | Small-ticket commercial real estate | Noncriticized
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 336
Percentage of portfolio		98.00%
Commercial Banking | Small-ticket commercial real estate | Criticized | Criticized performing
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 1
Percentage of portfolio		0.30%
Commercial Banking | Small-ticket commercial real estate | Criticized | Criticized nonperforming
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 6
Percentage of portfolio		1.70%

X

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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