Parent Company Financial Statements (Condensed Balance Sheet - Parent Company Only) (Detail) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Investments in subsidiaries:
Goodwill		$ 2,416	$ 2,416		$ 2,416
Other assets	[1]	7,844	7,965	[2]
Total Assets		142,177	141,048	[2],[3]	138,670	[4]
Liabilities
Other short-term borrowings		3,535	1,507
Accrued expenses and other liabilities	[1]	2,269	2,341
Long-term debt (external)	[1]	14,388	15,810	[2]
Total liabilities		125,945	125,178	[2]
Shareholders' Equity
Common stock	[5]	2,051	2,051
Preferred stock	[6]	1,331	1,331
Capital surplus		2,756	2,666
Retained earnings		13,441	12,358
Accumulated other comprehensive income		59	197		429		$ 82
Treasury stock	[5]	(3,433)	(2,764)
Noncontrolling interests		27	31
Total Equity		16,205	15,839
Total Equity		16,232	15,870		$ 15,665		$ 14,626
Total Liabilities and Equity		142,177	141,048
Parent Company Only
Assets
Cash		130	128
Short-term Investments		3,074	3,728
Loans to subsidiaries:
Nonbank subsidiaries		969	982
Total loans to subsidiaries		969	982
Investments in subsidiaries:
Nonbank subsidiaries		17,588	17,831
Total investment in subsidiaries		17,588	17,831
Goodwill		80	80
Other assets		366	414	[7]
Total Assets		22,207	23,163	[7]
Liabilities
Other short-term borrowings		344	404
Accrued expenses and other liabilities		461	433
Long-term debt (external)		5,170	6,456	[7]
Total liabilities		5,975	7,293	[7]
Shareholders' Equity
Common stock		2,051	2,051
Preferred stock		1,331	1,331
Capital surplus		2,756	2,666
Retained earnings		13,441	12,358
Accumulated other comprehensive income		59	197
Treasury stock		(3,433)	(2,764)
Noncontrolling interests		27	31
Total Equity		16,232	15,870
Total Liabilities and Equity		$ 22,207	$ 23,163	[7]

[1] Includes $ 85 and $ 152 of cash and due from banks, $ 1,216 and $ 2,537 of portfolio loans and leases, $ (26) and $ (28) of ALLL, $ 9 and $ 14 of other assets, $ 3 and $ 3 of other liabilities and $ 1,094 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2016 and 2015 , respectively. For further information, refer to Note 11.

[2] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Consolidated Balance Sheet was adjusted to reflect the reclassification of $34 of debt issuance costs from other assets to long-term debt. For further inform ation refer to Note 1 .

[3] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Consolidated Balance Sheet was adjusted to reflect the reclassification of $ 34 of debt issuance costs from other assets to long-term debt. For further information, refer to Note 1.

[4] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2014 Consolidated Balance Sheet was adjusted t o reflect the reclassification of $ 3 6 of debt issuance costs from other assets to long-term debt. For further information, refer to Note 1.

[5] Common shares: Stated value $ 2.22 per share; authori zed 2 billion ; outstanding at December 31, 2016 – 750,479,299 (excludes 173,413,282 treasury shares) , 2015 – 785,080,314 (excludes 138,812,267 treasury shares).

[6] 446,000 shares of undesignated no pa r value preferred stock are authorized and unissued at December 31, 2016 and 2015 ; fixed-to-floating rate non-cumulative Series H perpetual preferred stock with a $ 25,000 liquidation preference: 24,000 authorized shares, issued and outstanding at December 31, 2016 and 2015 ; fixed-to-floating rate non-cumulative Series I perpetual preferred stock with a $ 25,000 liquidation preference: 18,000 authorized shares, issued and outstanding at December 31, 2016 and 2015 ; and fixed-to-floating rate non-cumulative Series J perpetual preferred stock with a $ 25,000 liquidation preference: 12,000 authorized shares, issue d and outstanding at December 31, 2016 and 2015 .

[7] (a) Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Condensed Balance Sheet was adjusted to reflect the reclassification of $ 17 of debt issuance costs from other assets to long-term debt. For further information refer to Note 1 .