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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible assets |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ (2) | $ 5 |
Carrying amount of indefinite-lived intangible assets | 640 | 641 |
Carrying amount of indefinite-lived intangible assets - trade names | 69 | 69 |
Gross Carrying Amount | 642 | 608 |
Accumulated Amortization | (534) | (495) |
Net Carrying Amount | 108 | 113 |
Definite-lived intangible assets acquired during the year, amount assigned | $ 25 |  |
Definite-lived intangible assets acquired during the year, weighted-average amortization period | 5 years |  |
Aggregate amortization expense for definite-lived intangible assets | $ 31 | 37 | $ 30
Estimated intangible amortization expense for next five years: |  |  |
2021 | 32 |  |
2022 | 28 |  |
2023 | 24 |  |
2024 | 11 |  |
2025 | 7 |  |
Customer relationships [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 193 | 192 |
Accumulated Amortization | (155) | (146) |
Net Carrying Amount | 38 | 46 |
Contracts [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 223 | 219 |
Accumulated Amortization | (211) | (202) |
Net Carrying Amount | 12 | 17 |
Other [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 226 | 197 |
Accumulated Amortization | (168) | (147) |
Net Carrying Amount | $ 58 | $ 50 |

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