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Acquisitions - Carrying Value and Estimated Useful Lives (Details) - USD ($) $ in Millions | Jan. 01, 2023 | Aug. 09, 2022 | Dec. 31, 2023
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TitlePoint |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value | $ 54 |  | $ 54
TitlePoint | Customer relationships |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value | $ 3 |  |
Weighted average useful life (years) | 10 years |  |
TitlePoint | Trade Names [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value | $ 4 |  |
Weighted average useful life (years) | 10 years |  |
TitlePoint | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value | $ 47 |  |
Weighted average useful life (years) | 7 years |  |
AllFirst |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value |  | $ 55 | $ 55
AllFirst | Customer relationships |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value |  | $ 46 |
Weighted average useful life (years) |  | 10 years |
AllFirst | Trade Names [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value |  | $ 7 |
Weighted average useful life (years) |  | 10 years |
AllFirst | Noncompete Agreements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value |  | $ 1 |
Weighted average useful life (years) |  | 5 years |
AllFirst | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross Carrying Value |  | $ 1 |
Weighted average useful life (years) |  | 2 years |

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