Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Investment securities	$ 552,000,000	$ 552,000,000	$ 1,532,000,000
Notional amount	6,000,000,000.0	6,000,000,000.0	7,000,000,000.0
Equity securities without readily determinable fair values	$ 573,000,000	$ 573,000,000	$ 554,000,000
3.337% Senior Notes due December 2027
Derivative Instruments, Gain (Loss) [Line Items]
Stated interest rate	3.337%	3.337%
3.337% Senior Notes due December 2027 \| Senior Notes
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate principal amount	$ 1,350,000,000	$ 1,350,000,000
Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	200,000,000	$ 200,000,000
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]
Investment securities	544,000,000	$ 544,000,000	$ 1,514,000,000
Derivative assets	39,000,000	39,000,000	115,000,000
All other assets
Derivative Instruments, Gain (Loss) [Line Items]
Investment securities	8,000,000	8,000,000	18,000,000
Derivative assets	1,000,000	1,000,000	3,000,000
All other current liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability	34,000,000	34,000,000	48,000,000
All other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability	1,000,000	1,000,000	$ 4,000,000
C3.ai
Derivative Instruments, Gain (Loss) [Line Items]
Loss on equity securities	$ 27,000,000	$ 815,000,000
C3.ai \| Common Units Held by Baker Hughes
Derivative Instruments, Gain (Loss) [Line Items]
Investment shares owned (in shares)	8,650,476	8,650,476	10,813,095
Ownership percentage by noncontrolling owners	8.00%	8.00%	11.00%
Equity securities economic interest fair value	$ 541,000,000	$ 541,000,000	$ 1,500,000,000
Investments owned, number of shares sold (in shares)	2,200,000
Proceeds from sale of long-term investments	$ 145,000,000
Level 3
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on Level 3 instruments held at reporting date		$ 0

Investments Owned, Number of Shares Sold

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Face (par) amount of debt instrument at time of issuance.

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Nominal or face amount used to calculate payment on derivative.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) recognized in income from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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