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Background and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) reporting_unit segment | Dec. 31, 2023 USD ($)
Statement [Line Items] |  |
Bank overdrafts | $ 1 | $ 0
Accounts receivable, period past due | 30 days |
Number of reporting units | reporting_unit | 1 |
Number of operating segments | segment | 1 |
Capitalized software |  |
Statement [Line Items] |  |
Finite-lived intangible assets, maximum useful life | 7 years |
Affiliated Entity | Pension, Supplemental and Other Postretirement Benefit Plans |  |
Statement [Line Items] |  |
Pension settlement term | 30 years |
Revenue from affiliate | $ 52 | 57
Affiliated Entity | Pension, Supplemental and Other Postretirement Benefit Plans |  |
Statement [Line Items] |  |
Revenue from affiliate | $ 52 | $ 57
Minimum |  |
Statement [Line Items] |  |
Contract term | 1 year |
Maximum |  |
Statement [Line Items] |  |
Contract term | 5 years |
Customer relationship period for revenue recognition | 20 years |
Average | Consumer customers, average contract life |  |
Statement [Line Items] |  |
Customer life | 50 months |
Average | Business customer, average contract life |  |
Statement [Line Items] |  |
Customer life | 35 months |

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