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Nonoperating Income (Expense) (Narrative) (Details) $ / shares in Units, € in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) $ / shares | Oct. 24, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Other nonoperating income, net pension and postretirement benefits |  |  |  |  |  | $ 16 | $ 12 | $ 35
Gains on investments |  |  |  |  |  | 18 |  |
Other income, net |  |  |  |  |  | 5 |  |
Certain product lines, revenues |  |  |  |  |  |  | 170 |
Proceeds from sale of product lines | $ 826 |  |  |  |  | 826 | 0 | 0
Gain on sale of product lines | 455 |  |  |  |  | 455 | 0 | 0
Gain on sale of product lines, net of tax | $ 305 |  |  |  |  | $ 305 |  |
Gain on sale of product lines, net of tax, per diluted common share | $ / shares | $ 0.42 |  |  |  |  | $ 0.42 |  |
Payments of debt extinguishment costs |  | $ 7 |  |  | $ 7 | $ 26 | $ 7 | $ 0
Payments of debt extinguishment costs, after-tax |  | $ 5 |  |  | $ 5 |  |  |
Payments of debt extinguishment costs, per diluted common share | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  |  |
Senior notes | 1.7% senior unsecured notes due 2022 |  |  |  |  |  |  |  |
Repayments of debt | € |  |  |  | € 800 |  |  |  |
Interest rate of debt instrument |  |  | 1.70% | 1.70% | 1.70% | 1.70% | 1.70% |
Payments of debt extinguishment costs |  |  | $ 26 |  |  |  |  |
Payments of debt extinguishment costs, after-tax |  |  | $ 20 |  |  |  |  |
Payments of debt extinguishment costs, per diluted common share | $ / shares |  |  | $ 0.03 |  |  |  |  |
Senior notes | Redeemed notes |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 882 |  | $ 882 |  |  |
Senior notes | 2.4% senior unsecured notes due 2020 |  |  |  |  |  |  |  |
Repayments of debt |  | $ 500 |  |  |  |  |  |
Interest rate of debt instrument |  | 2.40% |  |  | 2.40% |  | 2.40% |
Senior notes | 5.0% senior unsecured notes due 2020 |  |  |  |  |  |  |  |
Repayments of debt |  | $ 375 |  |  |  |  |  |
Interest rate of debt instrument |  | 5.00% |  |  | 5.00% |  | 5.00% |
Pension benefit plans | Non-U.S. Pension Benefits |  |  |  |  |  |  |  |
Curtailment and settlement gains (losses) recognized |  |  |  |  |  | $ (1) | $ (7) |
Settlement loss, net of tax |  |  |  |  |  |  | $ (6) |
Settlement loss, per diluted common share | $ / shares |  |  |  |  |  |  | $ (0.01) |

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