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Parent Company (Details 1) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 25,208 | $ 22,762 | $ 22,288 | $ 19,486
Investment securities | 3,157 | 3,759 | 4,431 |
Accounts receivable, less reserves | 46,841 | 43,671 |  |
Premises and equipment, less accumulated depreciation | 4,433 | 4,108 |  |
Other assets | 10,561 | 10,069 |  |
Total assets | 158,893 | 161,184 | 159,000 |
Liabilities and Shareholders' Equity |  |  |  |
Long-term debt | 46,990 | 48,061 |  |
Total liabilities | 138,392 | 140,511 |  |
Shareholders' Equity |  |  |  |
Preferred shares | 0 | 0 |  |
Common shares | 181 | 194 |  |
Additional paid-in capital | 12,733 | 13,348 |  |
Retained earnings | 10,371 | 9,665 |  |
Accumulated other comprehensive loss | (2,784) | (2,534) |  |
Total shareholders' equity | 20,501 | 20,673 | 20,673 | 19,496
Total liabilities and shareholders' equity | 158,893 | 161,184 |  |
Parent Company Details (Textuals) [Abstract] |  |  |  |
Premises and equipment, accumulated depreciation | 5,145 | 6,801 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 5,229 | 6,400 | $ 8,824 | $ 6,076
Investment securities | 1 | 1 |  |
Equity in net assets of subsidiaries and affiliates | 20,522 | 19,856 |  |
Accounts receivable, less reserves | 513 | 311 |  |
Premises and equipment, less accumulated depreciation | 30 | 133 |  |
Loans to subsidiaries and affiliates | 7,620 | 11,762 |  |
Due from subsidiaries and affiliates | 867 | 896 |  |
Other assets | 277 | 275 |  |
Total assets | 35,059 | 39,634 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accounts payable and other liabilities | 1,531 | 1,603 |  |
Due to subsidiaries and affiliates | 619 | 716 |  |
Short-term debt of subsidiaries and affiliates | 4,044 | 6,923 |  |
Long-term debt | 8,364 | 9,719 |  |
Total liabilities | 14,558 | 18,961 |  |
Shareholders' Equity |  |  |  |
Preferred shares | 0 | 0 |  |
Common shares | 181 | 194 |  |
Additional paid-in capital | 12,733 | 13,348 |  |
Retained earnings | 10,371 | 9,665 |  |
Accumulated other comprehensive loss | (2,784) | (2,534) |  |
Total shareholders' equity | 20,501 | 20,673 |  |
Total liabilities and shareholders' equity | 35,059 | 39,634 |  |
Parent Company Details (Textuals) [Abstract] |  |  |  |
Premises and equipment, accumulated depreciation | $ 140 | $ 96 |  |

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