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Debt and Borrowing Arrangements - Uncommitted and Committed Credit Lines Available (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Borrowed Amount $ 71,000,000 $ 420,000,000  
Repayments of term loans 2,554,000,000 2,432,000,000 $ 3,032,000,000
Line of Credit | Credit Facility Expiry, July 29, 2025      
Debt Instrument [Line Items]      
Facility Amount [1] 1,500,000,000 0  
Borrowed Amount [1] 0 0  
Line of Credit | Credit Facility Expiry, February 23, 2027      
Debt Instrument [Line Items]      
Facility Amount [1] 4,500,000,000 4,500,000,000  
Borrowed Amount [1] 0 0  
Line of Credit | Credit Facility Expiry, Various      
Debt Instrument [Line Items]      
Facility Amount [2] 0 277,000,000  
Borrowed Amount [2] 0 277,000,000  
Line of Credit | Senior Unsecured Revolving Credit Facility | Revolving Credit Agreement      
Debt Instrument [Line Items]      
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) 39,400,000,000    
Line of Credit | Senior Unsecured Revolving Credit Facility | Revolving Credit Agreement | Minimum      
Debt Instrument [Line Items]      
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) 25,000,000,000    
Line of Credit      
Debt Instrument [Line Items]      
Borrowed Amount 71,000,000 74,000,000  
Line of Credit | Uncommitted credit facilities (1)      
Debt Instrument [Line Items]      
Facility Amount [3] 784,000,000 906,000,000  
Borrowed Amount [3] 71,000,000 74,000,000  
Line of Credit | Credit Facility Expiry, February 21, 2024      
Debt Instrument [Line Items]      
Facility Amount [1] 0 1,500,000,000  
Borrowed Amount [1] $ 0 $ 0  
[1] We maintain senior unsecured revolving credit facilities for general corporate purposes, including working capital needs, and to support our commercial paper program. The revolving credit agreements include a covenant that we maintain a minimum shareholders' equity of at least $25.0 billion, excluding accumulated other comprehensive earnings/(losses), the cumulative effects of any changes in accounting principles and earnings/(losses) recognized in connection with the ongoing application of any mark-to-market accounting for pensions and other retirement plans. At December 31, 2024, we complied with this covenant as our shareholders' equity, as defined by the covenant, was $39.4 billion. The revolving credit facility also contains customary representations, covenants and events of default. There are no credit rating triggers, provisions or other financial covenants that could require us to post collateral as security.
[2] On April 18, 2023, and subsequently amended on October 3, 2023 and April 4, 2024, we entered into a credit facility secured by pledged deposits classified as long-term other assets. Draw downs on the facility bore a variable rate based on SOFR plus applicable margin. On August 13, 2024, we repaid all amounts borrowed and terminated this credit facility
[3] Prior year facility amount has been revised.