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Financing Activities - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 01, 2020
USD ($)
$ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Initial conversion price (in USD per share) | $ / shares   $ 38.48        
Decrease in AOCI $ (10,417) $ (9,093)   $ (10,414) $ (8,876)  
Payments of long-term debt and finance lease obligations 93 67        
Capital in excess of par value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Decrease in AOCI $ (3,940) (4,220)   (4,224) (4,191)  
Cumulative Effect, Period of Adoption, Adjustment            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Decrease in AOCI       245 $ 0  
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Decrease in AOCI       $ 300    
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value | Accounting Standards Update 2020-06            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Decrease in AOCI     $ 300      
Convertible Debt            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Principal amount           $ 2,300
Stated interest rate           1.25%
Initial conversion ratio 0.0259909          
Initial conversion price (in USD per share) | $ / shares           $ 38.48
Amortization period (in years) 5 years          
Extinguishment of debt $ 164          
Repayments of long-term debt 230          
Write off of deferred debt issuance cost 3          
Loss on extinguishment of debt (69)          
Interest expense $ 9 $ 28        
Convertible Debt | Accounting Standards Update 2020-06            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Stated interest rate     1.25%      
Net carrying amount     $ 300      
Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value | Accounting Standards Update 2020-06            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Decrease in AOCI     $ 300      
Notes Due 2027            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Stated interest rate 5.125%          
Extinguishment of debt $ 30          
Repayments of long-term debt 34          
Loss on extinguishment of debt (3)          
Convertible Debt And Unsecured Debt            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payments of long-term debt and finance lease obligations $ 323