XML 649 R169.htm IDEA: XBRL DOCUMENT v3.20.4
Provisions (including post-retirement benefits) - Undiscounted Close-Down and Environmental Restoration Obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration cash flows $ 17,400 $ 16,066
Impact of discounting (4,065) (4,976)
Total closure obligation 13,335 11,090
United States of America    
Disclosure of other provisions [Line Items]    
Total closure obligation 3,819 3,377
Australia    
Disclosure of other provisions [Line Items]    
Total closure obligation 7,076 5,610
Canada    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,482 1,267
Rest of World    
Disclosure of other provisions [Line Items]    
Total closure obligation 958 836
Decommissioning, decontamination and demolition    
Disclosure of other provisions [Line Items]    
Total closure obligation 3,131 2,066
Closure and rehabilitation earthworks    
Disclosure of other provisions [Line Items]    
Total closure obligation 4,223 3,889
Long term water management costs    
Disclosure of other provisions [Line Items]    
Total closure obligation 966 920
Post closure monitoring and maintenance    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,318 855
Indirect costs, owners costs and estimating contingency    
Disclosure of other provisions [Line Items]    
Total closure obligation 3,697 3,360
Operating sites    
Disclosure of other provisions [Line Items]    
Total closure obligation 10,736 9,255
Non-operating sites    
Disclosure of other provisions [Line Items]    
Total closure obligation 2,599 1,835
Due within 1 year    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration cash flows 776 541
Between 1 and 3 years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration cash flows 1,203 955
Between 3 and 5 years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration cash flows 1,433 1,100
More than 5 years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration cash flows $ 13,988 $ 13,470