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v3.20.4

REVENUE - Rollforward (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract] |
Balance at January 1 (after adopting ASU 2016-13) | $ 5
Provision for expected credit losses during the period | 3
Write-offs charged against the allowance | (2)
Recoveries of amounts previously written off | 1
Balance at end of year | $ 7

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