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Basis Of Presentation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Basis of Presentation [Line Items]          
Net Cash Provided by (Used in) Operating Activities     $ (3,135) $ (3,870)  
Cash, Cash Equivalents, and Short-term Investments $ 11,400   11,400   $ 16,200
Debt and Lease Obligation 57,200   57,200   58,100
Debt, Current 5,406   5,406   1,296
Line of Credit Facility, Maximum Borrowing Capacity 6,300   6,300    
Increase/(Decrease) in revenue due to change in accounting estimate (273) $ 223 (885) 230  
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate $ (411) $ 234 $ (1,541) $ 58  
Change in Earnings Per Share Due to Change in Accounting Estimate $ (0.29) $ 0.41 $ (2.27) $ (0.03)  
Three Hundred And Sixty Four Day Revolving Credit Facility          
Basis of Presentation [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 3,100   $ 3,100    
Senior Notes [Member] | 2022          
Basis of Presentation [Line Items]          
Long-term Debt, Current Maturities 300   300    
Senior Notes [Member] | 2023 | First Quarter          
Basis of Presentation [Line Items]          
Long-term Debt, Current Maturities 1,700   1,700    
Senior Notes [Member] | 2023 | Second Quarter          
Basis of Presentation [Line Items]          
Long-term Debt, Current Maturities 3,400   3,400    
Supply Chain Financing [Member]          
Basis of Presentation [Line Items]          
Accounts Payable, Trade 2,400   2,400   $ 2,300
Revolving Credit Facility          
Basis of Presentation [Line Items]          
Debt Instrument, Unused Borrowing Capacity, Amount $ 14,700   $ 14,700