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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investment securities, fair value $ 1,008   $ 1,008   $ 982
Accrued interest, current $ 497   $ 497   $ 473
Accrued interest, current, statement of financial position All other current assets (Note 9)   All other current assets (Note 9)   All other current assets (Note 9)
Debt securities in unrealized loss position, total $ 18,065   $ 18,065   $ 21,876
Debt securities in unrealized loss position, 12 months or more 15,368   15,368   14,011
Gross unrealized losses, 12 months or more (2,463)   (2,463)   (2,795)
Investments without readily determinable fair value 2,090   2,090   1,439
Fair value adjustments, including impairment 57 $ 37 157 $ 100  
Level 3          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investments with a fair value 4,298   4,298   5,074
AerCap          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investment securities, fair value 1,008   1,008   982
Insurance          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investments without readily determinable fair value $ 1,760   1,760   $ 1,410
Investment securities | Level 3          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Transfers out of level 3     $ 1,246