Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) (Qualified defined benefit pension plans, USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 29, 2014
Qualified defined benefit pension plans
Changes in benefit obligations due to re-measurements
Plan amendments related to the salary freeze	$ 4,580
New longevity assumptions	(3,390)
Discount rate	(3,309)	[1]
Other	157
Increase in benefit obligations due to re-measurements	(1,962)
Incremental return on plan assets recognized in re-measurements	904	[2]
Increase in net benefit obligations due to re-measurements	$ (1,058)

[1] Reflects a decrease in the discount rate from 4.75% at December 31, 2013 to 4.25% in June 2014.

[2] The incremental return on plan assets recognized in re-measurements represents the difference between our actual return on plan assets of 6.70% and our expected return of 4.00% for the six months ended June 29, 2014 (the half-year proportional effect of our expected 8.00% annual long-term rate of return on plan assets assumption).