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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Assets and Liabilities at Fair Value Subject to Three-Tier Hierarchy
Our assets are measured at fair value subject to the three-tier hierarchy at June 30, 2020, were as follows:
 Fair Value Measurements at Reporting Date Using
Quoted Prices in
Active Markets for
Identical Assets		Significant
Other Observable
Inputs		Significant
Unobservable
Inputs
(in millions)(Level 1)(Level 2)(Level 3)
Financial assets measured on a recurring basis:   
Cash equivalents$2  $—  $—  
Mutual funds — fixed income securities50  —  —  
Mutual funds — equity securities9  —  —  
Total$61  $—  $—  
Our assets measured at fair value subject to the three-tier hierarchy at December 31, 2019, were as follows:
 Fair Value Measurements at Reporting Date Using
Quoted Prices in
Active Markets for
Identical Assets		Significant
Other Observable
Inputs		Significant
Unobservable
Inputs
(in millions)(Level 1)(Level 2)(Level 3)
Financial assets measured on a recurring basis:   
Mutual funds — fixed income securities$50  $—  $—  
Mutual funds — equity securities8  —  —  
Interest rate swap derivatives—  3  —  
Total$58  $3  $—