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Allowance for Loan and Lease Losses and Reserve for Unfunded Lending Commitments - Components of Allowance for Loan and Lease Losses by Impairment Methodology (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan and lease losses by impairment methodology:
Collectively evaluated	$ 6,854	$ 6,882
Asset-specific	354	338
Total allowance for loan and lease losses	7,208	7,220
Loans held for investment by impairment methodology:
Collectively evaluated	263,791	243,920
Asset-specific	1,892	1,844
Loans held for investment	$ 265,809	$ 245,899	$ 254,473
Allowance as a percentage of period-end loans held for investment	2.71%	2.94%
Credit Card
Allowance for loan and lease losses by impairment methodology:
Collectively evaluated	$ 5,185	$ 5,258
Asset-specific	210	277
Total allowance for loan and lease losses	5,395	5,535	5,648	$ 4,606
Loans held for investment by impairment methodology:
Collectively evaluated	127,312	115,505
Asset-specific	831	855
Loans held for investment	$ 128,236	$ 116,361
Allowance as a percentage of period-end loans held for investment	4.21%	4.76%
Consumer Banking
Allowance for loan and lease losses by impairment methodology:
Collectively evaluated	$ 1,010	$ 1,021
Asset-specific	28	27
Total allowance for loan and lease losses	1,038	1,048	1,242	1,102
Loans held for investment by impairment methodology:
Collectively evaluated	62,675	58,808
Asset-specific	388	393
Loans held for investment	$ 63,065	$ 59,205
Allowance as a percentage of period-end loans held for investment	1.65%	1.77%
Commercial Banking
Allowance for loan and lease losses by impairment methodology:
Collectively evaluated	$ 659	$ 603
Asset-specific	116	34
Total allowance for loan and lease losses	775	637	$ 611	$ 793
Loans held for investment by impairment methodology:
Collectively evaluated	73,804	69,607
Asset-specific	673	596
Loans held for investment	$ 74,508	$ 70,333
Allowance as a percentage of period-end loans held for investment	1.04%	0.91%
PCI loans
Loans held for investment by impairment methodology:
Loans held for investment	$ 126	$ 135
PCI loans | Credit Card
Loans held for investment by impairment methodology:
Loans held for investment	93	1
PCI loans | Consumer Banking
Loans held for investment by impairment methodology:
Loans held for investment	2	4
PCI loans | Commercial Banking
Loans held for investment by impairment methodology:
Loans held for investment	$ 31	$ 130

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Financing Receivable, Allowance for Credit Losses, Percentage of Held for Investment Loans

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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