Benefit Plans (Projected Benefit Obligations, Plan Assets And Funded Status Of Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 02, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year		$ 6,167	$ 5,275
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	350
Service cost		79	74	80
Interest cost		344	351	356
Net pension liability recognized at December 31		(1,757)	(1,690)
Defined Benefit Obligation [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year		6,965	6,439
Service cost		79	74
Interest cost		344	351
Benefits paid		(420)	(371)
Actuarial losses		956	460
Termination		0	17
Other		0	(5)
Benefit obligation at end of year		7,924	6,965
Net pension liability recognized at December 31		(1,757)	(1,690)
Defined Benefit Plan Assets [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year		5,275	5,218
Actual return on plan assets		755	188
Employer contributions		557	240
Benefits paid		(420)	(371)
Fair value of plan assets at end of year		$ 6,167	$ 5,275