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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible assets |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 5 |  |
Carrying amount of indefinite-lived intangible assets | 641 | $ 646 |
Carrying amount of indefinite-lived intangible assets - trade names | 69 | 69 |
Gross Carrying Amount | 608 | 567 |
Accumulated Amortization | (495) | (451) |
Net Carrying Amount | 113 | 116 |
Definite-lived intangible assets acquired during the year, amount assigned | $ 35 |  |
Definite-lived intangible assets acquired during the year, weighted-average amortization period | 5 years 6 months |  |
Aggregate amortization expense for definite-lived intangible assets | $ 37 | 30 | $ 27
Estimated intangible amortization expense for next five years: |  |  |
2020 | 28 |  |
2021 | 25 |  |
2022 | 21 |  |
2023 | 18 |  |
2024 | 6 |  |
Customer relationships [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 192 | 184 |
Accumulated Amortization | (146) | (134) |
Net Carrying Amount | 46 | 50 |
Contracts [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 219 | 215 |
Accumulated Amortization | (202) | (193) |
Net Carrying Amount | 17 | 22 |
Other [Member] |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 197 | 168 |
Accumulated Amortization | (147) | (124) |
Net Carrying Amount | $ 50 | $ 44 |

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