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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill [Line Items] |  |
Gross Carrying Amount | $ 622 | $ 663
Accumulated Amortization | 369 | 347
Core Deposit Intangibles [Member] |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 355 | 396
Accumulated Amortization | 193 | 184
Purchased Credit Card Relationship Intangible [Member] |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 152 | 152
Accumulated Amortization | 145 | 138
Other Intangible Assets [Member] |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 115 | 115
Accumulated Amortization | $ 31 | $ 25

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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