Current Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Outstanding checks in excess of bank account balances	$ 205	$ 219
Other Current Liabilities
Accrued income taxes	79	71
Interest payable	169	246
Production, property, and other taxes payable	344	216
Accrued employee benefits	270	210
Derivatives	491	384
Other	149	183
Total other current liabilities	$ 1,502	$ 1,310