XML 189 R97.htm IDEA: XBRL DOCUMENT v3.8.0.1
Payroll, staff and employee benefits obligations - Recognized in income and comprehensive income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Actuarial (Gains) Losses      
Benefit amounts recognized on Equity $ (823) $ 371 $ (557)
Pension benefits      
Employee benefits obligations      
Current service cost 263 251 271
Past service cost 239 (92) (35)
Settlements (1)   (14)
Net interest cost 64 66 84
Benefit amounts recognized on Profit & Loss 565 225 306
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions (16) (56) (41)
Effect of changes in financial assumptions (241) 1,008 (384)
Effect of experience adjustments (193) (190) (108)
Actual return on plan assets (excluding interest income) (344) (421) 48
Effect of asset ceiling 7 (7) (1)
Benefit amounts recognized on Equity (787) 334 (486)
Total benefit amounts recognized on comprehensive income (222) 559 (180)
Other benefits      
Employee benefits obligations      
Current service cost 16 13 17
Past service cost 12    
Net interest cost 17 21 22
Benefit amounts recognized on Profit & Loss 45 34 39
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions 3 (7) (10)
Effect of changes in financial assumptions (5) 48 (27)
Effect of experience adjustments (34) (4) (34)
Benefit amounts recognized on Equity (36) 37 (71)
Total benefit amounts recognized on comprehensive income $ 9 $ 71 $ (32)