Cash Flow Information - Parenthetical (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Cash Flow Information [Abstract] | |||
| Discretionary payment to domestic qualified pension plan. | $ 324 | $ 120 | $ 600 |
| ConocoPhillips Vs Petroleos de Venezuela SA [Member] | |||
| Loss Contingencies [Line Items] | |||
| Cash Proceeds from Legal Settlements | $ 330 | 430 | |
| Burlington Resources Inc Vs The Republic Of Ecuador [Member] | |||
| Loss Contingencies [Line Items] | |||
| Cash Proceeds from Legal Settlements | $ 262 | 75 | |
| Currency Swap [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Payments for Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ 180 | ||