Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017
Loans Held-for-sale, Fair Value Disclosure		$ 1,428		$ 1,577
Loans Receivable, Fair Value Disclosure		$ 188		196
Other Assets, Fair Value Disclosure				$ 56
Common stock, par value		$ 1.00		$ 1.00
Loans and Leases Receivable, Gross	[1]	$ 142,618		$ 143,181
Long-term Debt	[2]	$ 10,692		$ 9,785
Common Stock, Shares, Outstanding	[3]	469,708		470,931
Variable Interest Entity, Primary Beneficiary [Member]
Loans and Leases Receivable, Gross		$ 171		$ 179
Long-term Debt		182		189
Treasury Stock and Other
Stockholders' Equity Attributable to Noncontrolling Interest		101		103		$ 101
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Gross		$ 38,273		$ 38,620
Restricted Stock [Member]
Common Stock, Shares, Outstanding		9		9
Trading Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 1,248		$ 1,086
Available-for-sale Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		214		223
Fair Value, Measurements, Recurring [Member]
Loans Held-for-sale, Fair Value Disclosure		1,428		1,577
Loans Receivable, Fair Value Disclosure		188		196
Servicing Asset at Fair Value, Amount		1,916		1,710
Other Assets, Fair Value Disclosure		143	[4]	56	[5]
Long-term Debt, Fair Value		209		530
Brokered Time Deposits [Member] | Fair Value, Measurements, Recurring [Member]
Deposits, Fair Value Disclosure		$ 302		$ 236

[1] Includes loans of consolidated VIEs of $171 million and $179 million at March 31, 2018 and December 31, 2017, respectively.

[2] Includes debt of consolidated VIEs of $182 million and $189 million at March 31, 2018 and December 31, 2017, respectively.

[3] Includes restricted shares of 9 thousand and 9 thousand at March 31, 2018 and December 31, 2017, respectively.

[4] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.

[5] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.