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Compensation and Benefit Plans (Plan Assets - Changes in Level 3 Fair Value) (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended					12 Months Ended
	Dec. 31, 2012 Postretirement Benefits Other Than Pensions	Dec. 31, 2011 Postretirement Benefits Other Than Pensions	Dec. 31, 2010 Postretirement Benefits Other Than Pensions	Dec. 31, 2012 Postretirement Benefits Other Than Pensions Level 3	Dec. 31, 2011 Postretirement Benefits Other Than Pensions Level 3	Dec. 31, 2012 Pension Plans	Dec. 31, 2011 Pension Plans	Dec. 31, 2010 Pension Plans	Dec. 31, 2012 Pension Plans Level 3	Dec. 31, 2011 Pension Plans Level 3
Change in plan assets
Fair value of plan assets at beginning of year	$ 1,800	$ 1,570	$ 1,606	$ 130	$ 92	$ 3,542	$ 3,153	$ 3,235	$ 448	$ 345
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Relating to assets still held at end of period				20	(3)				88	6
Relating to assets sold during the period				5	6				13	22
Purchases				35	48				98	130
Dispositions				(24)	(13)				(233)	(55)
Transfers in and/or out of Level 3				0	0				0	0
Fair value of plan assets at end of year	$ 1,800	$ 1,570	$ 1,606	$ 166	$ 130	$ 3,542	$ 3,153	$ 3,235	$ 414	$ 448

The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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