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SPECIAL ITEMS (Tables) | 12 Months Ended
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Dec. 31, 2020
Unusual or Infrequent Items, or Both [Abstract] |
Merger-related Costs [Table Text Block] | The following breaks down merger-related costs incurred in 2020, 2019 and 2018 (in millions):
| 2020 |  | 2019 |  | 2018
Consulting and professional services | $ | 5 |  |  | $ | 18 |  |  | $ | 45 |
Employee-related costs(a) | — |  |  | 15 |  |  | 13 |
Legal and accounting fees | 1 |  |  | 1 |  |  | 1 |
Other merger-related costs(b) | — |  |  | 10 |  |  | 28 |
Total Merger-related Costs | $ | 6 |  |  | $ | 44 |  |  | $ | 87 |
(a)Employee-related costs consist primarily of vacation balance true-ups, severance, retention bonuses, and training and skill development. (b)Other merger-related costs consist primarily of costs for marketing and advertising, IT, employee appreciation and company sponsored events, moving expenses, supplies, and other immaterial expenses.

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