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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Realized tax benefits | $ 20,000,000 | $ 24,000,000 | $ 15,000,000
Share-based compensation expense | 0 | 0 | 0
Tax benefit associated with stock-based compensation expense | 3,000,000 | 10,000,000 | 18,000,000
Cash portion of RSU paid | 27,000,000 |  |
Fair value of restricted stock units vested | $ 80,000,000 | 91,000,000 | 62,000,000
Stock option expiration period | 10 years |  |
Stock options granted in period (shares) | 0 |  |
Cash received from stock options exercised |  | 23,000,000 | $ 12,000,000
EDCP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferral period (years) | 3 years |  |
DCPD |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Net liability recognized | $ 7,000,000 | $ 9,000,000 |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized cost, period for recognition | 3 years |  |
Granted (in dollars per share) | $ 44.42 | $ 41.23 | $ 36,780,000
Unrecognized cost | $ 23,000,000 |  |
Performance-based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award paid in stock (percent) | 66.67% |  |
Award paid in cash (percent) | 33.33% |  |
Liability recognized | $ 16,000,000 |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 2 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 10 years |  |
ICP 2020 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum limit of total stock awards (in shares) | 10,000,000 |  |
Stock-based compensation award number of shares available for future | 13,700,000 |  |
ICP 2015 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum limit of total stock awards (in shares) | 10,000,000 |  |
Stock-based compensation award number of shares available for future | 0 |  |
401(k) Savings Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 1,000,000 | 1,000,000 |

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