Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk (Offsetting Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk [Abstract]
Resale agreements, Gross Asset	$ 8,088	$ 10,186
Resale agreements, Net Amounts Presented in the Consolidated Balance Sheet	8,088	10,186
Resale agreements, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(8,088)	(10,186)
Resale agreements, Net Amount	0	0
Securities borrowed, Gross Asset	198	187
Securities borrowed, Net Amounts Presented in the Consolidated Balance Sheet	198	187
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(70)	(69)
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(127)	(117)
Securities borrowed, Net Amount	1	1
Total Gross Assets	8,286	10,373
Total Assets, Net Amounts Presented in the Consolidated Balance Sheet	8,286	10,373
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(70)	(69)
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(8,215)	(10,303)
Total Assets, Net Amount	$ 1	$ 1

Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk [Abstract]

No definition available.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount, after effects of master netting arrangements, of securities borrowed from entities in exchange for collateral offset against an obligation to return collateral under a master netting arrangement. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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Amount, after effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against securities purchased under agreement to resell.

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Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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