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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | $ 49 | $ 84 | $ 97
Current liabilities associated with discontinued operations |  | 459 |
Long-term liabilities associated with discontinued operations |  | 185 |
Reduction of workforce [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | 41 |  |
Expense associated with accelerated awards | 11 |  |
Reduction of workforce [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expense associated with accelerated awards |  | 31 | 31
Reduction of workforce [Member] | Defined Benefit Settlements [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | 9 | 7 | 14
Reduction of workforce [Member] | Employee Related Costs [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs |  | $ 84 | $ 97
Prior years' restructurings [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Current liabilities associated with discontinued operations | 30 |  |
Long-term liabilities associated with discontinued operations | 136 |  |
Underwriting, bank, legal and accounting fees | $ 8 |  |

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