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SHAREHOLDERS' EQUITY - Stock Repurchase (Details) - USD ($) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 10, 2021 | Sep. 30, 2019
Class of Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 2,000,000,000.0
Repurchase and retirement of common stock (in shares) | 18.8 | 20.1 | 18.6 |  |
Repurchase and retirement of common stock to offset the dilutive impact of the grant of long-term stock awards (in shares) | 0.4 | 0.6 | 0.7 |  |
Repurchase and retirement of common stock | $ 727,000,000 | $ 896,000,000 | $ 654,000,000 |  |
Remaining authorized repurchase amount | $ 774,000,000 |  |  |  |
Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 2,000,000,000.0 |

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