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Debt and Borrowing Arrangements - Uncommitted and Committed Credit Lines Available (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Amount Outstanding $ 64,000,000 $ 29,000,000
Line of Credit | Credit Facility Expiring February 27, 2024    
Debt Instrument [Line Items]    
Facility Amount [1] 4,500,000,000 4,500,000,000
Borrowed Amount [1] 0 0
Line of Credit | Multi-year Senior Unsecured Revolving Credit Facility Expiring February 27, 2024 | Revolving Credit Agreement    
Debt Instrument [Line Items]    
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) 38,100,000,000  
Line of Credit | Multi-year Senior Unsecured Revolving Credit Facility Expiring February 27, 2024 | Revolving Credit Agreement | Minimum    
Debt Instrument [Line Items]    
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) 24,600,000,000  
Line of Credit    
Debt Instrument [Line Items]    
Amount Outstanding 51,000,000 29,000,000
Line of Credit | Uncommitted credit facilities    
Debt Instrument [Line Items]    
Facility Amount 1,496,000,000 1,487,000,000
Amount Outstanding 51,000,000 29,000,000
Line of Credit | Credit Facility Expiring February 24, 2021    
Debt Instrument [Line Items]    
Facility Amount [1] 0 1,500,000,000
Amount Outstanding [1] 0 0
Line of Credit | Credit Facility Expiring February 23, 2022    
Debt Instrument [Line Items]    
Facility Amount [1] 2,500,000,000 0
Amount Outstanding [1] $ 0 $ 0
[1] We maintain a multi-year senior unsecured revolving credit facility for general corporate purposes, including working capital needs, and to support our commercial paper program. The revolving credit agreement includes a covenant that we maintain a minimum shareholders' equity of at least $24.6 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 June 30, 2021, we complied with this covenant as our shareholders' equity, as defined by the covenant, was $38.1 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.