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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs | $ 0 | $ 18 | $ 0 | $ 230
Defined Benefit Settlements [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs |  |  |  | 40
Reduction of workforce [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs |  |  |  | 65
Reduction Of Workforce [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Noncash-Accelerated vesting |  |  |  | 21
Transaction Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Transaction costs |  | $ 48 |  | 48
Merger Integration [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs |  |  |  | $ 182

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