Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans Held-for-sale, Fair Value Disclosure		$ 1,577	$ 3,540
Loans Receivable, Fair Value Disclosure		196	222
Long-term Debt, Fair Value		$ 530	$ 963
Common stock, par value		$ 1.00	$ 1.00
Loans and Leases Receivable, Gross	[1]	$ 143,181	$ 143,298
Long-term Debt	[2],[3]	$ 9,785	$ 11,748
Common Stock, Shares, Outstanding	[4]	470,931	491,188
Variable Interest Entity, Primary Beneficiary [Member]
Loans and Leases Receivable, Gross		$ 179	$ 211
Long-term Debt		189	222
Treasury Stock and Other
Stockholders' Equity Attributable to Noncontrolling Interest		103	103	$ 108
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Gross		$ 38,620	$ 38,990
Restricted Stock [Member]
Common Stock, Shares, Outstanding		9	11
Trading Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 1,086	$ 1,437
Available-for-sale Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		223	0
Fair Value, Measurements, Recurring [Member]
Loans Held-for-sale, Fair Value Disclosure		1,577	3,540
Loans Receivable, Fair Value Disclosure		196	222
Servicing Asset at Fair Value, Amount		1,710	1,572
Long-term Debt, Fair Value		530	963
Brokered Time Deposits [Member] | Fair Value, Measurements, Recurring [Member]
Deposits, Fair Value Disclosure		$ 236	$ 78

[1] Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.

[2] Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.

[3] Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.

[4] Includes restricted shares of 9 thousand and 11 thousand at December 31, 2017 and December 31, 2016, respectively.