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Disclosures About Offsetting Assets and Liabilities - Offsetting Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Offsetting [Abstract]
Derivative Liability, Fair Value, Gross Liability Net Of CollateraL Received	$ 833	$ 1,630
Derivative Liability, Fair Value, Gross Asset Net Of CollateraL Received	832	1,608
Derivative Liability	1	22
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	0	0
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Cash Colleteral Pledged	0	0
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Net Amount	$ 1	$ 22

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details