v3.23.1
Fair Value Measures and Disclosures (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
kiloMetricTon
MMBTU
Mar. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
MMBTU
kiloMetricTon
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Asset $ 7       $ 21
Derivative Liability 29       8
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (21) $ (143)      
Realized Gain (Loss) on Cash Flow Hedging Instruments (6) (53)      
Unrealized Gain (Loss) on Derivatives (20) 2      
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Asset 0       0
Derivative Liability (7)       $ (14)
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging | Other Comprehensive Income (Loss)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ (9) (156)      
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging | Other Assets          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount 2       17
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | kiloMetricTon 337       368
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging | Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized Gain (Loss) on Cash Flow Hedging Instruments $ (1) (54)      
Designated as Hedging Instrument | Aluminum Contract | Cash Flow Hedging | Cost of Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized Gain (Loss) on Cash Flow Hedging Instruments 0 (1)      
Designated as Hedging Instrument | Commodity Contract | Cash Flow Hedging          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Asset (1)       $ (1)
Derivative Liability 0       $ 1
Designated as Hedging Instrument | Commodity Contract | Cash Flow Hedging | Other Comprehensive Income (Loss)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ 1 0      
Designated as Hedging Instrument | Commodity Contract | Cash Flow Hedging | Other Assets          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | kiloMetricTon 1       1
Designated as Hedging Instrument | Commodity Contract | Cash Flow Hedging | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | kiloMetricTon 2       3
Designated as Hedging Instrument | Energy Related Derivative | Cash Flow Hedging          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Liability $ 14       $ 5
Designated as Hedging Instrument | Energy Related Derivative | Cash Flow Hedging | Other Comprehensive Income (Loss)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ (13) 13      
Designated as Hedging Instrument | Energy Related Derivative | Cash Flow Hedging | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | MMBTU 2.3       6.3
Designated as Hedging Instrument | Energy Related Derivative | Cash Flow Hedging | Cost of Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized Gain (Loss) on Cash Flow Hedging Instruments $ 5 0      
Not Designated as Hedging Instrument          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Derivatives (20) 5      
Realized Gain (Loss) on Derivatives 3 (2)      
Not Designated as Hedging Instrument | Aluminum Contract          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Asset 4       $ 6
Derivative Liability $ 15       $ 12
Not Designated as Hedging Instrument | Aluminum Contract | Other Assets          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | kiloMetricTon 137       60
Not Designated as Hedging Instrument | Aluminum Contract | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | kiloMetricTon 113       53
Not Designated as Hedging Instrument | Aluminum Contract | Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Derivatives $ (5) 2      
Realized Gain (Loss) on Derivatives 4 (2)      
Not Designated as Hedging Instrument | Energy Related Derivative          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative Asset 4       $ 16
Derivative Liability $ 7       $ 4
Not Designated as Hedging Instrument | Energy Related Derivative | Other Assets          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | MMBTU 5.9       12.1
Not Designated as Hedging Instrument | Energy Related Derivative | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative, Nonmonetary Notional Amount | MMBTU 3.8       0.6
Not Designated as Hedging Instrument | Energy Related Derivative | Cost of Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Derivatives $ 15 (3)      
Realized Gain (Loss) on Derivatives 1 0      
Not Designated as Hedging Instrument | Natural Gas Contract | Cost of Sales          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized Gain (Loss) on Derivatives   (5) $ 2 $ 6  
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net   $ 3      
Reported Value Measurement          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash and Cash Equivalents, Fair Value Disclosure 197       $ 261
Derivative Asset 7       21
Other Short-term Borrowings 50       0
Derivative Liability 29       8
Debt, fair value 1,597       1,597
Estimate of Fair Value Measurement          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash and Cash Equivalents, Fair Value Disclosure 197       261
Derivative Asset 7       21
Other Short-term Borrowings 50       0
Derivative Liability 29       8
Debt, fair value $ 1,595       $ 1,539