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POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 29, 2019
Retirement Benefits [Abstract]  
Schedule of Pretax Net Periodic Benefit Cost
Our pretax net periodic benefit cost related to our qualified defined benefit pension plans and retiree medical and life insurance plans consisted of the following (in millions):
 
 
Quarters Ended
 
Nine Months Ended
 
 
September 29,
2019
 
September 30,
2018
 
September 29,
2019
 
September 30,
2018
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
129

 
 
$
157

 
 
$
387

 
 
$
472

 
Interest cost
 
452

 
 
435

 
 
1,355

 
 
1,305

 
Expected return on plan assets
 
(575
)
 
 
(599
)
 
 
(1,725
)
 
 
(1,796
)
 
Recognized net actuarial losses
 
351

 
 
444

 
 
1,053

 
 
1,332

 
Amortization of prior service credits
 
(83
)
 
 
(81
)
 
 
(250
)
 
 
(244
)
 
Total net periodic benefit cost
 
$
274

 
 
$
356

 
 
$
820

 
 
$
1,069

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
4

 
 
$
4

 
 
$
11

 
 
$
13

 
Interest cost
 
25

 
 
23

 
 
73

 
 
69

 
Expected return on plan assets
 
(28
)
 
 
(34
)
 
 
(83
)
 
 
(101
)
 
Recognized net actuarial losses
 
1

 
 
2

 
 
2

 
 
4

 
Amortization of prior service costs
 
10

 
 
4

 
 
31

 
 
11

 
Total net periodic benefit cost (credit)
 
$
12

 
 
$
(1
)
 
 
$
34

 
 
$
(4
)