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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs | $ 18 | $ 32 | $ 230 | $ 32
Reduction of workforce [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs |  | 32 | 182 |
Noncash restructuring costs |  | $ 11 | 21 |
Reduction Of Workforce [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Noncash restructuring costs |  |  | 65 |
Reduction Of Workforce [Member] | Defined Benefit Settlements [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and transaction costs |  |  | 40 |
Transaction Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Underwriting, bank, legal and accounting fees | $ 48 |  | $ 48 |

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