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Financial Instruments - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
Financial Instruments - Narrative (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Investment securities	$ 101,000,000	$ 283,000,000
Derivative, transfer to earnings	4,000,000
Derivative, notional amount	6,700,000,000	$ 5,700,000,000
Equity securities without readily determinable fair values	$ 637,000,000
Equity method on our investment in BJ Services			$ 0
Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, term	1 year	1 year
All other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets	$ 106,000,000	$ 52,000,000
All other assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets	3,000,000	6,000,000
All other current liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability	61,000,000	24,000,000
All other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability	2,000,000	3,000,000
Related party amount, due to related party \| GE
Derivative Instruments, Gain (Loss) [Line Items]
Investment securities	26,000,000	$ 111,000,000
Level 3
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on Level 3 instruments held at reporting date	$ 0