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Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash and due from banks | $ 732 | $ 678 |
Short-term investments | 1,272 | 2,562 |
Securities available for sale | 21,843 | 19,428 |
Total loans | 93,746 | 88,669 |
Goodwill | 2,664 | 2,516 | $ 2,538
Corporate-owned life insurance | 4,233 | 4,171 |
Derivative assets | 780 | 531 |
Accrued income and other assets | 5,494 | 5,030 |
Total assets | 144,988 | 139,613 |
Accrued expense and other liabilities | 2,540 | 2,113 |
Total long-term debt | 12,448 | 13,732 |
Total liabilities | 127,950 | 124,017 |
SHAREHOLDERS' EQUITY | 17,038 | 15,595 |
Total liabilities and equity | 144,988 | 139,613 |
Key [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash and due from banks | 3,813 | 3,241 |
Short-term investments | 20 | 19 |
Securities available for sale | 10 | 10 |
Other investments | 36 | 31 |
Total loans | 66 | 81 |
Total investment in subsidiaries | 17,792 | 16,387 |
Goodwill | 167 | 167 |
Corporate-owned life insurance | 205 | 199 |
Derivative assets | 44 | 61 |
Accrued income and other assets | 295 | 279 |
Total assets | 22,448 | 20,475 |
Accrued expense and other liabilities | 492 | 480 |
Long term debt due to Subsidiaries | 483 | 471 |
Total long-term debt | 4,918 | 4,400 |
Total liabilities | 5,410 | 4,880 |
SHAREHOLDERS' EQUITY | 17,038 | 15,595 |
Total liabilities and equity | 22,448 | 20,475 |
Key [Member] | Banks [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Total loans | 50 | 50 |
Investment in subsidiaries | 16,969 | 15,554 |
Key [Member] | Nonbank Subsidiaries [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Total loans | 16 | 31 |
Investment in subsidiaries | 823 | 833 |
Key [Member] | Unaffiliated Companies [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Total long-term debt | $ 4,435 | $ 3,929 |

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