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Summary of Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Other Costs [Table Text Block] | Engineering, research, development, and advertising expenses for the years ended December 31 were as follows (in billions):
| 2019 |  | 2020 |  | 2021
Engineering, research, and development | $ | 7.4 |  |  | $ | 7.1 |  |  | $ | 7.6 |
Advertising | 3.6 |  |  | 2.8 |  |  | 3.1 |

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