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Fair Value Measurements and Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents the balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2022:
(dollars in millions)
Level 1(1)
Level 2(2)
Level 3(3)
Total
Assets:
Prepaid expenses and other:
Fixed income securities$— $37 $— $37 
Cross currency swaps— 42 — 42 
Foreign exchange forwards— 6 — 6 
Interest rate caps— 63 — 63 
Other assets:
Fixed income securities— 349 — 349 
Cross currency swaps— 263 — 263 
Interest rate caps— 30 — 30 
Total$— $790 $— $790 
Liabilities:
Other current liabilities:
Interest rate swaps$— $731 $— $731 
Cross currency swaps— 346 — 346 
Interest rate caps— 63 — 63 
Foreign exchange forwards— 1 — 1 
Contingent consideration— — 274 274 
Other liabilities:
Interest rate swaps— 3,902 — 3,902 
Cross currency swaps— 3,295 — 3,295 
Interest rate caps— 30 — 30 
Contingent consideration— — 43 43 
Total$— $8,368 $317 $8,685 
(1) Quoted prices in active markets for identical assets or liabilities.
(2) Observable inputs other than quoted prices in active markets for identical assets and liabilities.
(3) Unobservable pricing inputs in the market.
The following table presents the balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2021:
(dollars in millions)
Level 1 (1)
Level 2 (2)
Level 3 (3)
Total
Assets:
Prepaid expenses and other:
Fixed income securities$— $18 $— $18 
Interest rate swaps— 188 — 188 
Cross currency swaps— 9 — 9 
  Foreign exchange forwards— 12 — 12 
Other assets:
  Fixed income securities— 391 — 391 
  Interest rate swaps— 285 — 285 
  Cross currency swaps— 580 — 580 
Interest rate caps— 44 — 44 
Total$— $1,527 $— $1,527 
Liabilities:
Other current liabilities:
Interest rate swaps$— $1 $— $1 
Forward starting interest rate swaps— 302 — 302 
Cross currency swaps— 218 — 218 
Contingent consideration— — 231 231 
Other liabilities:
  Interest rate swaps— 665 — 665 
  Cross currency swaps— 1,406 — 1,406 
Interest rate caps— 44 — 44 
Contingent consideration— — 313 313 
Total$— $2,636 $544 $3,180 
(1) Quoted prices in active markets for identical assets or liabilities.
(2) Observable inputs other than quoted prices in active markets for identical assets and liabilities.
(3) Unobservable pricing inputs in the market.
Schedule of Fair Value of Short-Term and Long-Term Debt, Excluding Capital Leases
The fair value of our short-term and long-term debt, excluding finance leases, was as follows:

Fair Value
(dollars in millions)Carrying
Amount		Level 1Level 2Level 3Total
At December 31, 2021$149,543 $106,599 $62,606 $— $169,205 
At December 31, 2022148,906 84,385 54,656 — 139,041 
Notional Amounts of Outstanding Derivative Instruments
The following table sets forth the notional amounts of our outstanding derivative instruments:
(dollars in millions)
At December 31,20222021
Interest rate swaps$26,071 $19,779 
Cross currency swaps34,976 32,502 
Forward starting interest rate swaps— 1,000 
Foreign exchange forwards920 932 
Schedule Of Derivative Instruments Activity
The following tables summarize the activities of our designated derivatives:
(dollars in millions)
Years Ended December 31,20222021
Interest Rate Swaps:
Notional value entered into$7,155 $6,050 
Notional value settled863 4,018 
Pre-tax gain recognized in Interest expense2 2 
Cross Currency Swaps:
Notional value entered into2,474 6,214 
Notional value settled— — 
Pre-tax loss recognized in Other comprehensive loss (1)
(430)(2,285)
Pre-tax loss on cross currency swaps recognized in Interest expense(1,373)N/A
Pre-tax gain on hedged debt recognized in Interest expense1,373 N/A
Excluded components recognized in Other comprehensive loss
(498)N/A
Initial value of the excluded component amortized into Interest expense81 N/A
Forward Starting Interest Rate Swaps:
Notional value entered into— — 
Notional value settled1,000 1,000 
Pre-tax gain recognized in Other comprehensive loss
196 258 
Treasury Rate Locks:
Notional value entered into— 4,650 
    Notional value settled— 4,650 
Pre-tax gain recognized in Other comprehensive loss
— 251 
N/A - not applicable
(1) Represents amounts recorded under the cash flow hedge model. These instruments were re-designated as fair value hedges on March 31, 2022.
(dollars in millions)
Years Ended December 31,20222021
Other, net Cash Flows from Operating Activities:
  Cash received for settlement of interest rate swaps$40 $107 
  Cash paid for settlement of forward starting interest rate swaps(107)(237)
  Cash received for settlement of treasury rate locks— 251 
The following table summarizes the activity of our derivatives not designated in hedging relationships:
(dollars in millions)
Years Ended December 31,20222021
Foreign Exchange Forwards:
Notional value entered into$10,689 $12,604 
Notional value settled10,701 13,077 
Pre-tax loss recognized in Other income (expense), net
(97)(62)
Swaptions:
Notional value sold1,000 2,000 
Notional value settled1,000 2,000 
Pre-tax gain (loss) recognized in Interest expense(33)11 
Schedule of Cumulative Basis Adjustments for Fair Value Hedges
The following table displays the amounts recorded in Long-term debt in our consolidated balance sheets related to cumulative basis adjustments for fair value hedges. The cumulative amounts exclude cumulative basis adjustments related to foreign exchange risk.
(dollars in millions)
At December 31,20222021
Carrying amount of hedged liabilities$21,741 $20,027 
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged liabilities(4,512)(113)
Cumulative amount of fair value hedging adjustment remaining for which hedge accounting has been discontinued488 575