Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 |
Designated as Hedging Instrument | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | $ 22 | $ 7 |
Fair value of derivative instruments, Liabilities | 30 | 10 |
Fair value of derivative instruments, Net Assets/(Liabilities) | (8) | (3) |
Designated as Hedging Instrument | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 14 | 6 |
Designated as Hedging Instrument | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 8 | 1 |
Designated as Hedging Instrument | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 20 | 6 |
Designated as Hedging Instrument | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 10 | 4 |
Designated as Hedging Instrument | Commodity Contracts | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 8 | 6 |
Fair value of derivative instruments, Liabilities | 22 | 9 |
Fair value of derivative instruments, Net Assets/(Liabilities) | (14) | (3) |
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 8 | 5 |
Designated as Hedging Instrument | Commodity Contracts | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | | 1 |
Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 17 | 6 |
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 5 | 3 |
Designated as Hedging Instrument | Foreign Currency Forward Contracts | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 12 | 1 |
Fair value of derivative instruments, Liabilities | 8 | |
Fair value of derivative instruments, Net Assets/(Liabilities) | 4 | 1 |
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 6 | 1 |
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 6 | |
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 3 | |
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 5 | |
Designated as Hedging Instrument | Interest Rate Contracts | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 2 | |
Fair value of derivative instruments, Liabilities | | 1 |
Fair value of derivative instruments, Net Assets/(Liabilities) | 2 | (1) |
Designated as Hedging Instrument | Interest Rate Contracts | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 2 | |
Designated as Hedging Instrument | Interest Rate Contracts | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | | 1 |
Not Designated as Hedging Instrument | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 13 | 17 |
Fair value of derivative instruments, Liabilities | 7 | 16 |
Fair value of derivative instruments, Net Assets/(Liabilities) | 6 | 1 |
Not Designated as Hedging Instrument | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 12 | 16 |
Not Designated as Hedging Instrument | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 1 | 1 |
Not Designated as Hedging Instrument | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 4 | 12 |
Not Designated as Hedging Instrument | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 3 | 4 |
Not Designated as Hedging Instrument | Commodity Contracts | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 2 | |
Fair value of derivative instruments, Liabilities | 1 | 3 |
Fair value of derivative instruments, Net Assets/(Liabilities) | 1 | (3) |
Not Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 2 | |
Not Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 1 | 3 |
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 11 | 17 |
Fair value of derivative instruments, Liabilities | 6 | 13 |
Fair value of derivative instruments, Net Assets/(Liabilities) | 5 | 4 |
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 10 | 16 |
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Assets | 1 | 1 |
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | 3 | 9 |
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities | | |
Fair value of derivatives | | |
Fair value of derivative instruments, Liabilities | $ 3 | $ 4 |