v3.19.3.a.u2
Property, Plant And Equipment And Asset Retirement Obligations (Asset Retirement Obligations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant And Equipment And Asset Retirement Obligations [Abstract]    
Beginning balance $ 12,103 $ 12,705
Accretion expense and other provisions 649 681
Reduction due to property sales (1,085) (333)
Payments made (827) (600)
Liabilities incurred 89 46
Foreign currency translation 84 (481)
Revisions 267 85
Ending balance $ 11,280 $ 12,103