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Short-Term Borrowings (Securities Sold Under Repurchase Agreements By Collateral Type) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Short Term Debt
Securities sold under repurchase agreements	$ 661	$ 925
Overnight maturity \| U.S. Treasury and federal agencies
Short Term Debt
Securities sold under repurchase agreements	0	279
Overnight maturity \| Agency mortgage-backed securities \| Residential mortgage backed securities
Short Term Debt
Securities sold under repurchase agreements	$ 661	$ 646

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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