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Financial Instruments and Fair Value - Narrative (Details)
1 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
derivative_instrument
Mar. 31, 2020
USD ($)
Oct. 31, 2018
CHF (SFr)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jul. 18, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Equity method investments       $ 22,000,000 $ 24,000,000      
Net unrealized gain (loss)       (10,000,000) 11,000,000 $ 0    
Unrealized gain (loss) on derivatives for cash flow hedges, net of taxes       86,000,000 (61,000,000) 0    
Interest rate swaps, tax       0 15,000,000 $ 0    
Expected reclassification from accumulated other comprehensive loss       2,000,000        
Reclassification from AOCI       28,000,000 7,000,000      
Cross-currency fixed interest rate swap | Not Designated as Hedging Instrument                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Notional amount (USD, CHF)       1,212,000,000 1,391,000,000      
Cross-currency fixed interest rate swap | Designated as Hedging Instrument | Net Investment Hedging                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Notional amount (USD, CHF) | SFr     SFr 750,000,000          
Term of contract     5 years          
Cash benefit for liquidation         35,000,000      
Interest included in cash benefit         2,000,000      
Forward-starting interest rate contracts designated as cash flow hedges | Designated as Hedging Instrument | Cash Flow Hedging                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Notional amount (USD, CHF) $ 2,100,000,000 $ 4,100,000,000            
Derivative, number of instruments terminated | derivative_instrument 6              
Derivative, notional amount of contracts terminated $ 2,100,000,000              
Derivative, number of instruments entered into | derivative_instrument 24              
Interest rate swaps, tax       0        
Terminated Interest Rate Swaps                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Unrealized gain (loss) on derivatives for cash flow hedges, net of taxes   $ 2,000,000            
Aratana                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Maximum aggregate contingent payment         12,000,000     $ 12,000,000
Prevtec                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Maximum aggregate contingent payment         16,000,000   $ 16,000,000  
Decrease of fair value of contingent consideration liability         $ 4,000,000      
Artana and Prevtec                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Gain on writeoff of contingent consideration liability       $ 1,000,000