Post-employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2019

Employee Benefits [Abstract]

Components of post-employment benefit plans service cost

COMPONENTS OF POST-EMPLOYMENT BENEFIT PLANS SERVICE COST

		THREE MONTHS				SIX MONTHS
FOR THE PERIOD ENDED JUNE 30		2019		2018		2019		2018
DB pension		(48	)	(53	)	(96	)	(106	)
DC pension		(25	)	(24	)	(59	)	(57	)
OPEBs		—		(1	)	(1	)	(2	)
Less:
	Capitalized benefit plans cost	15		15		29		29
Total post-employment benefit plans service cost included in operating costs		(58	)	(63	)	(127	)	(136	)
Other costs recognized in severance, acquisition and other costs		—		—		—		(4	)
Total post-employment benefit plans service cost		(58	)	(63	)	(127	)	(140	)

Components of post-employment benefit plans financing cost

COMPONENTS OF POST-EMPLOYMENT BENEFIT PLANS FINANCING COST

	THREE MONTHS				SIX MONTHS
FOR THE PERIOD ENDED JUNE 30	2019		2018		2019		2018
DB pension	(5	)	(5	)	(10	)	(11	)
OPEBs	(10	)	(12	)	(21	)	(23	)
Total interest on post-employment benefit obligations	(15	)	(17	)	(31	)	(34	)