Revenues from Services (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
Dec. 31, 2013 |
Dec. 31, 2014 |
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| Subsidiary Revenue From Services [Line Items] | |||||||||||
| Interest on loans | $ 3,010 | $ 3,128 | $ 8,902 | $ 9,194 | |||||||
| Revenues from services (Note 9) | [1] | 6,290 | 6,356 | 17,388 | 19,134 | ||||||
| Net other-than-temporary impairments on investment securities | $ 0 | ||||||||||
| Assets | [1],[2] | 433,819 | 433,819 | $ 502,570 | |||||||
| Financing Receivable, Net | [1] | 83,748 | 83,748 | 122,457 | |||||||
| Liabilities | [1],[2] | 362,493 | 362,493 | 412,172 | |||||||
| Deposits | 48,656 | 48,656 | 43,841 | ||||||||
| Revenues | [1] | 6,312 | 6,384 | 17,452 | 19,223 | ||||||
| Significant associated companies [Member] | |||||||||||
| Subsidiary Revenue From Services [Line Items] | |||||||||||
| Assets | 54,302 | 54,302 | 78,632 | ||||||||
| Financing Receivable, Net | 25,334 | 25,334 | 46,481 | ||||||||
| Liabilities | 37,402 | 37,402 | $ 57,273 | ||||||||
| Revenues | 2,990 | 3,612 | 9,469 | 14,162 | |||||||
| Net earnings | $ 328 | $ 784 | $ 1,030 | $ 2,281 | |||||||
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