XML 86 R73.htm IDEA: XBRL DOCUMENT v3.10.0.1
Retirement benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Defined benefit plans          
Expected payments for remainder of fiscal year $ 2,000,000   $ 2,000,000   $ 1,000,000
Retirement benefits expense     $ 43,000,000 $ 25,000,000  
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case (in years)     5 years    
Defined contribution plan, expenses recognized     $ 4,800,000 5,100,000  
Cash contributions by the employer to defined contribution plan     5,900,000 5,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Expected payments for remainder of fiscal year 1,000,000   1,000,000   500,000
Retirement benefits expense     40,000,000 22,000,000  
Defined contribution plan, expenses recognized     1,700,000 1,400,000  
Cash contributions by the employer to defined contribution plan     1,700,000 1,400,000  
Pension benefits          
Defined benefit plans          
Contributions made to defined benefit plans     38,000,000 50,000,000  
Contributions expected to be paid in current year 38,000,000   38,000,000   67,000,000
Service cost 17,223,000 $ 16,271,000 51,764,000 48,635,000  
Interest cost 19,340,000 20,304,000 58,033,000 60,881,000  
Expected return on plan assets (27,237,000) (25,689,000) (81,715,000) (77,056,000)  
Amortization of net prior service gain (11,000) (14,000) (32,000) (41,000)  
Amortization of net actuarial loss 7,527,000 6,638,000 22,556,000 19,858,000  
Net periodic pension/benefit cost (return) 16,842,000 17,510,000 50,606,000 52,277,000  
Impact of PUC D&Os 7,785,000 (4,534,000) 17,621,000 (14,557,000)  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 24,627,000 12,976,000 68,227,000 37,720,000  
Pension benefits | American Savings Bank (ASB)          
Defined benefit plans          
Contributions expected to be paid in current year 0   0   0
Pension benefits | Hawaiian Electric Industries, Inc.          
Defined benefit plans          
Contributions expected to be paid in current year 1,000,000   1,000,000   1,000,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Contributions made to defined benefit plans     37,000,000 49,000,000  
Contributions expected to be paid in current year 37,000,000   37,000,000   $ 66,000,000
Service cost 16,840,000 15,764,000 50,520,000 47,294,000  
Interest cost 17,824,000 18,659,000 53,471,000 55,974,000  
Expected return on plan assets (25,593,000) (23,973,000) (76,777,000) (71,919,000)  
Amortization of net prior service gain 2,000 2,000 6,000 6,000  
Amortization of net actuarial loss 6,826,000 6,098,000 20,477,000 18,294,000  
Net periodic pension/benefit cost (return) 15,899,000 16,550,000 47,697,000 49,649,000  
Impact of PUC D&Os 7,785,000 (4,534,000) 17,621,000 (14,557,000)  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 23,684,000 12,016,000 65,318,000 35,092,000  
Other benefits          
Defined benefit plans          
Service cost 680,000 843,000 2,041,000 2,530,000  
Interest cost 1,986,000 2,363,000 5,947,000 7,089,000  
Expected return on plan assets (3,224,000) (3,078,000) (9,683,000) (9,248,000)  
Amortization of net prior service gain (451,000) (448,000) (1,354,000) (1,345,000)  
Amortization of net actuarial loss 25,000 283,000 71,000 848,000  
Net periodic pension/benefit cost (return) (984,000) (37,000) (2,978,000) (126,000)  
Impact of PUC D&Os 953,000 346,000 3,048,000 1,019,000  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (31,000) 309,000 70,000 893,000  
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Service cost 676,000 839,000 2,028,000 2,515,000  
Interest cost 1,907,000 2,279,000 5,721,000 6,837,000  
Expected return on plan assets (3,178,000) (3,037,000) (9,534,000) (9,110,000)  
Amortization of net prior service gain (451,000) (451,000) (1,353,000) (1,353,000)  
Amortization of net actuarial loss 25,000 275,000 74,000 826,000  
Net periodic pension/benefit cost (return) (1,021,000) (95,000) (3,064,000) (285,000)  
Impact of PUC D&Os 953,000 346,000 3,048,000 1,019,000  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ (68,000) $ 251,000 $ (16,000) $ 734,000