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Employee Benefits - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 benefit_plan | Dec. 31, 2009 benefit_plan
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pre-tax AOCI not yet recognized as net pension cost |  | $ 471,000,000 | $ 511,000,000 |  |  |
Accumulated benefit obligation for all pension plans |  | $ 1,200,000,000 | $ 1,200,000,000 |  |  |
Percentage increase or decrease in expected return on plan assets |  | 0.25% |  |  |  |
Estimated increase or decrease in net pension cost |  | $ 3,000,000 |  |  |  |
Percentage increase or decrease in assumed discount rate |  | 0.25% |  |  |  |
Estimated change in net pension cost due to discount rate |  | $ 2,000,000 |  |  |  |
Expected return on plan assets |  | 4.50% | 4.75% | 6.00% |  |
Expected return on plan assets on estimating 2013 pension cost |  | 3.75% |  |  |  |
Employer contribution to saving plan |  | 6.00% |  |  |  |
Annual increase to default employee contribution, percent |  | 1.00% |  |  |  |
Employer discretionary contribution, required service period |  | 1 year |  |  |  |
Employer discretionary contribution percentage |  | 1.00% | 2.00% | 2.00% |  |
Additional employer discretionary contribution amount, per full-time employee |  | $ 1,000 |  |  |  |
Additional employer discretionary contribution amount, per part-time employee |  | 500 |  |  |  |
Additional employer discretionary contribution amount, salary requirement |  | 100,000 |  |  |  |
Total expenses associated with saving plan |  | $ 98,000,000 | $ 106,000,000 | $ 129,000,000 |  |
Initial Default Percentage [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Initial default employee contribution, percent |  | 2.00% |  |  |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2020 |  | $ 94,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2021 |  | 93,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2022 |  | 91,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2023 |  | 90,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2024 |  | 88,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2025 through 2029 |  | 394,000,000 |  |  |  |
Accumulated benefit obligation for all pension plans |  | 1,054,000,000 | 1,029,000,000 |  |  |
Net pension cost (benefit) |  | $ 29,000,000 | $ 22,000,000 | $ (5,000,000) |  |
Expected return on plan assets |  | 4.50% | 4.75% | 6.00% |  |
Discount rate |  | 2.89% | 4.00% |  |  |
Other Postretirement Benefit Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pre-tax AOCI not yet recognized as net pension cost |  | $ (27,000,000) | $ (12,000,000) |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2020 |  | 7,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2021 |  | 7,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2022 |  | 6,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2023 |  | 5,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2024 |  | 5,000,000 |  |  |  |
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2025 through 2029 |  | 24,000,000 |  |  |  |
Net pension cost (benefit) |  | $ (1,000,000) | $ (1,000,000) | $ 1,000,000 |  |
Expected return on plan assets |  | 4.50% | 4.50% | 4.50% |  |
Age of employees under condition one |  | 55 years |  |  |  |
Period of service under condition one |  | 5 years |  |  |  |
Age of employees under condition two |  | 50 years |  |  |  |
Period of service under condition two |  | 15 years |  |  |  |
Minimum period of service at the time of termination hired before 2001 |  | 15 years |  |  |  |
Discount rate |  | 4.50% | 4.00% |  |  |
First Niagara Bank, N.A. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Number of plans | benefit_plan |  |  |  |  | 2 | 2
Forecast [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net pension cost (benefit) | $ 13,000,000 |  |  |  |  |
Forecast [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net pension cost (benefit) | $ 0 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employees contribution to saving plan |  | 1.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employees contribution to saving plan |  | 100.00% |  |  |  |
Default employee contribution, percent |  | 10.00% |  |  |  |

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