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, 2013 Postretirement Benefits Other Than Pensions	Dec. 31, 2012 Postretirement Benefits Other Than Pensions	Dec. 31, 2011 Postretirement Benefits Other Than Pensions	Dec. 31, 2013 Postretirement Benefits Other Than Pensions Level 3	Dec. 31, 2012 Postretirement Benefits Other Than Pensions Level 3	Dec. 31, 2013 Pension Plans	Dec. 31, 2012 Pension Plans	Dec. 31, 2011 Pension Plans	Dec. 31, 2013 Pension Plans Level 3	Dec. 31, 2012 Pension Plans Level 3
Change in plan assets
Fair value of plan assets at beginning of year	$ 2,065	$ 1,800	$ 1,570	$ 166	$ 130	$ 3,477	$ 3,542	$ 3,153	$ 414	$ 448
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Relating to assets still held at end of period				24	20				61	88
Relating to assets sold during the period				5	5				10	13
Purchases				23	35				45	98
Dispositions				(54)	(24)				(140)	(233)
Transfers in and/or out of Level 3				0	0				0	0
Fair value of plan assets at end of year	$ 2,065	$ 1,800	$ 1,570	$ 164	$ 166	$ 3,477	$ 3,542	$ 3,153	$ 390	$ 414