Retirement Plans (Net Periodic Pension Expense For Qualified And Nonqualified U.S. Defined Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 152	$ 121	$ 116
Interest cost	604	544	541
Expected return on plan assets	(753)	(713)	(631)
Actuarial (gain) loss	307	212	174
Amortization of prior service cost	32	31	31
Curtailment gain	0	0	0
Settlement gain	0	0	0
Net periodic pension expense	342	195	231
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2	3
Interest cost	12	12	12
Expected return on plan assets	(12)	(12)	(11)
Actuarial (gain) loss	0	0	0
Amortization of prior service cost	0	0	0
Curtailment gain	0	0	(2)
Settlement gain	0	(1)	(2)
Net periodic pension expense	$ 3	$ 1	$ 0