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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis The following tables summarize our assets and liabilities that are measured at fair value on a recurring basis.
Basis of fair value measurement
(in millions)Balance as of December 31,
2021		Quoted prices
in active
markets for
identical assets
(Level 1)		Significant
other
observable
inputs
(Level 2)		Significant
unobservable
inputs
(Level 3)
Assets
Foreign exchange contracts$8 $— $8 $— 
Debt securities30 — — 30 
Marketable equity securities 10 10 — — 
Total$48 $10 $8 $30 
Liabilities
Foreign exchange contracts$5 $— $5 $— 
Contingent payments related to acquisitions143 — — 143 
Total$148 $— $5 $143 
Basis of fair value measurement
(in millions)Balance as of December 31,
2020		Quoted prices
in active
markets for
identical assets
(Level 1)		Significant
other
observable
inputs
(Level 2)		Significant
unobservable
inputs
(Level 3)
Assets
Foreign exchange contracts$11 $— $11 $— 
Debt securities13 — 13 — 
Marketable equity securities17 17 — — 
Total$41 $17 $24 $— 
Liabilities
Foreign exchange contracts$19 $— $19 $— 
Contingent payments related to acquisitions30 — — 30 
Total$49 $— $19 $30 
Reconciliation of Fair Value Measurements that Use Significant Unobservable Inputs The following table is a reconciliation of our recurring fair value measurements that use significant unobservable inputs (Level 3), which consist of contingent payments related to acquisitions.
as of and for the years ended December 31 (in millions)20212020
Fair value at beginning of period$30 $39 
Additions135 4 
Change in fair value recognized in earnings(6)(2)
Payments(16)(11)
Fair value at end of period$143 $30 
Book Values and Fair Values of Financial Instruments For these financial instruments, the following table provides the values recognized in the consolidated
balance sheets and the estimated fair values.
Book valuesFair values(a)
as of December 31 (in millions)2021202020212020
Liabilities
Short-term debt$301 $— $301 $— 
Current maturities of long-term debt and finance lease obligations210 406 212 409 
Long-term debt and finance lease obligations17,149 5,786 17,568 6,471 
(a)    These fair value amounts are classified as Level 2 within the fair value hierarchy as they are estimated based on observable inputs.