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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill by segment were as follows:
| (Stated in millions) |
| Reservoir |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Characterization |  |  | Drilling |  |  | Production |  |  | Cameron |  |  | Total |
Balance, January 1, 2019 | $ | 4,703 |  |  | $ | 10,111 |  |  | $ | 4,678 |  |  | $ | 5,439 |  |  | $ | 24,931 |
Impairment (see Note 3) |  | (97 | ) |  |  | (3,025 | ) |  |  | (705 | ) |  |  | (5,001 | ) |  |  | (8,828 | )
Impact of changes in exchange rates and other |  | (46 | ) |  |  | 6 |  |  |  | (24 | ) |  |  | 3 |  |  |  | (61 | )
Balance, December 31, 2019 |  | 4,560 |  |  |  | 7,092 |  |  |  | 3,949 |  |  |  | 441 |  |  |  | 16,042 |
Impairment (see Note 3) |  | - |  |  |  | (1,659 | ) |  |  | (1,228 | ) |  |  | (183 | ) |  |  | (3,070 | )
Impact of changes in exchange rates and other |  | - |  |  |  | 10 |  |  |  | (17 | ) |  |  | 3 |  |  |  | (4 | )
Balance, September 30, 2020 | $ | 4,560 |  |  | $ | 5,443 |  |  | $ | 2,704 |  |  | $ | 261 |  |  | $ | 12,968 |
In connection with the change in reportable segments discussed in Note 16 – Segment Information, Schlumberger reallocated goodwill that existed as of September 30, 2020 to the new reporting units on a relative fair value basis as follows:
| (Stated in millions) |
| Digital & |  |  | Reservoir |  |  | Well |  |  | Production |  |  |  |  |
| Integration |  |  | Performance |  |  | Construction |  |  | Systems |  |  | Total |
Balance, October 1, 2020 | $ | 2,041 |  |  | $ | 3,806 |  |  | $ | 6,267 |  |  | $ | 854 |  |  | $ | 12,968 |
Impact of changes in exchange rates and other |  | 6 |  |  |  | (4 | ) |  |  | 11 |  |  |  | (1 | ) |  |  | 12 |
Balance, December 31, 2020 | $ | 2,047 |  |  | $ | 3,802 |  |  | $ | 6,278 |  |  | $ | 853 |  |  | $ | 12,980 |

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