INTANGIBLES, NET | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2024 | | | Weighted- average useful lives in years | | Gross carrying value | | Accumulated amortization | | Net carrying value | | Management and hotel services agreement and franchise agreement intangibles | 15 | | $ | 889 | | | $ | (296) | | | $ | 593 | | | Brand and other indefinite-lived intangibles | — | | 638 | | | — | | | 638 | | | Customer relationships intangibles | 10 | | 411 | | | (141) | | | 270 | | | Other intangibles | 11 | | 33 | | | (8) | | | 25 | | | Total | | | $ | 1,971 | | | $ | (445) | | | $ | 1,526 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2023 | | | | | Gross carrying value | | Accumulated amortization | | Net carrying value | | Management and hotel services agreement and franchise agreement intangibles | | | $ | 906 | | | $ | (248) | | | $ | 658 | | | Brand and other indefinite-lived intangibles | | | 608 | | | — | | | 608 | | | Customer relationships intangibles | | | 620 | | | (243) | | | 377 | | | Other intangibles | | | 33 | | | (6) | | | 27 | | | Total | | | $ | 2,167 | | | $ | (497) | | | $ | 1,670 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | | | 2024 | | 2023 | | 2024 | | 2023 | | | | | | Amortization expense | $ | 31 | | | $ | 44 | | | $ | 98 | | | $ | 133 | | | | | |
During the three and nine months ended September 30, 2024, we recognized $9 million and $11 million, respectively, of impairment charges, and during the three and nine months ended September 30, 2023, we recognized $5 million and $12 million, respectively, of impairment charges in asset impairments on our condensed consolidated statements of income. The impairment charges were primarily related to management and franchise agreement intangibles and were a result of contract terminations within our management and franchising segment.
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