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Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Plans [Abstract]  
Net Periodic Pension And OPEB Cost/(Benefit) The components of our net periodic pension cost were as follows:

Three Months Ended

Six Months Ended

June 30,

June 30,

Millions

2020 

2019 

2020 

2019 

Service cost

$

26 

$

22 

$

53 

$

44 

Interest cost

35 

40 

69 

80 

Expected return on plan assets

(70)

(68)

(140)

(136)

Amortization of actuarial loss

24 

16 

52 

32 

Net periodic pension cost

$

15 

$

10 

$

34 

$

20 

The components of our net periodic OPEB costs were as follows:

Three Months Ended

Six Months Ended

June 30,

June 30,

Millions

2020 

2019 

2020 

2019 

Service cost

$

1 

$

1 

$

1 

$

1 

Interest cost

2 

2 

3 

5 

Amortization of:

Prior service cost

(4)

-

(7)

-

Actuarial loss

2 

2 

4 

3 

Net periodic OPEB cost

$

1 

$

5 

$

1 

$

9