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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
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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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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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