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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Fair value, after the effects of master netting arrangements, of a financial liability or 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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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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Fair Value Measurements (Details 5) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Fair Value Measurements
Restricted investments	$ 0	$ 121
Mortgage servicing rights	1,237	1,022	1,002	1,209
Derivative assets	87	178
Derivative liabilities	32	39
Recurring basis \| Level Two
Fair Value Measurements
Restricted investments		121
Mortgage loans held for sale	1,096	2,110
Recurring basis \| Level Two \| Forward delivery commitments
Fair Value Measurements
Derivative assets	25	15
Derivative liabilities	69	19
Recurring basis \| Level Two \| Option contracts
Fair Value Measurements
Derivative assets	1	2
Recurring basis \| Level Two \| MSR-related agreements
Fair Value Measurements
Derivative assets		5
Recurring basis \| Level Two \| Interest rate contracts
Fair Value Measurements
Derivative assets	2	1
Recurring basis \| Level Three
Fair Value Measurements
Mortgage loans held for sale	59	64
Mortgage servicing rights	1,237	1,022
Recurring basis \| Level Three \| Interest rate lock commitments
Fair Value Measurements
Derivative assets	62	140
Derivative liabilities		1
Recurring basis \| Level Three \| Convertible note-related agreements
Fair Value Measurements
Derivative assets	18	27
Derivative liabilities	18	27
Recurring basis \| Cash Collateral and Netting \| Forward delivery commitments
Fair Value Measurements
Derivative assets	(21)	(7)
Derivative liabilities	(55)	(13)
Recurring basis \| Cash Collateral and Netting \| MSR-related agreements
Fair Value Measurements
Derivative assets		(5)
Derivative liabilities		5
Recurring basis \| Total
Fair Value Measurements
Restricted investments		121
Mortgage loans held for sale	1,155	2,174
Mortgage servicing rights	1,237	1,022
Recurring basis \| Total \| Interest rate lock commitments
Fair Value Measurements
Derivative assets	62	140
Derivative liabilities		1
Recurring basis \| Total \| Forward delivery commitments
Fair Value Measurements
Derivative assets	4	8
Derivative liabilities	14	6
Recurring basis \| Total \| Option contracts
Fair Value Measurements
Derivative assets	1	2
Recurring basis \| Total \| MSR-related agreements
Fair Value Measurements
Derivative liabilities		5
Recurring basis \| Total \| Interest rate contracts
Fair Value Measurements
Derivative assets	2	1
Recurring basis \| Total \| Convertible note-related agreements
Fair Value Measurements
Derivative assets	18	27
Derivative liabilities	$ 18	$ 27