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Debt - Narrative (Details) - USD ($) $ in Millions	May 25, 2023	Jun. 30, 2023	May 23, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	$ 1,133	$ 1,100
Debt repurchase, incurred debt discount	33
Gain (loss) on repurchase of debt instrument	27
Total debt		16,400		$ 16,600
Notes Payable to Banks | 5.3% Note due 2053
Debt Instrument [Line Items]
Stated interest rate			5.30%
Debt at face value			$ 1,100
Notes Payable to Banks | 3.35% Notes due 2024
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	$ 160
Stated interest rate	3.35%
Debt at face value	$ 426
Notes Payable to Banks | 2.125% Notes due 2024
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	$ 439
Stated interest rate	2.125%
Debt at face value	$ 900
Notes Payable to Banks | 2.4% Notes due 2025
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	$ 534
Stated interest rate	2.40%
Debt at face value	$ 900
Variable Rate Debt Bonds
Debt Instrument [Line Items]
Debt at face value		283
Revolving Credit Facility
Debt Instrument [Line Items]
Project finance facility, maximum borrowing capacity		5,500
Minimum limit of debt for cross default provision		200
Letter of Credit | Maximum
Debt Instrument [Line Items]
Line of credit facility, capacity available for specific purpose other than for trade purchases		$ 500

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