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Retirement and Deferred Compensation Plans (Benefit Plans' Assets and Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 1,589 | $ 1,420
Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,520 | 1,356
Projected benefit obligation | 1,646 | 1,477
Funded status | (126) | (121)
Amounts Recognized on the Consolidated Balance Sheets |  |
Other assets | 12 | 52
Other liabilities | (138) | (173)
Net amount recognized | $ (126) | $ (121)
Weighted-Average Assumptions, Benefit obligations: |  |
Weighted-average discount rate | 3.14% | 4.14%
Weighted-Average Assumptions, Net periodic benefit cost: |  |
Weighted-average discount rate | 4.10% | 3.75%
Expected return on plan assets | 6.48% | 6.46%
Other Postretirement Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 69 | $ 64
Projected benefit obligation | 78 | 74
Funded status | (9) | (10)
Amounts Recognized on the Consolidated Balance Sheets |  |
Other liabilities | (9) | (10)
Net amount recognized | $ (9) | $ (10)
Weighted-Average Assumptions, Benefit obligations: |  |
Weighted-average discount rate | 3.50% | 4.50%
Weighted-Average Assumptions, Net periodic benefit cost: |  |
Weighted-average discount rate | 4.50% | 4.00%
Expected return on plan assets | 6.50% | 6.50%

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