Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Line of credit facility, expiration period		5 years
Interest costs incurred		$ 2,560	$ 2,650	$ 2,790
Interest paid, including capitalized interest, operating and investing activities		2,408	$ 2,572	$ 2,583
Five Year Credit Facility Expiring - August 2028
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,000
Line of credit facility, expiration period	5 years
364 Day Revolving Credit Facility - Expiring August 2024
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 800
Line of credit facility, expiration period	364 days
364 Day Revolving Credit Facility - Expiring August 2025
Debt Instrument [Line Items]
Line of credit facility, expiration period	364 days
Line of credit facility, term out period	1 year
Three Year Credit Facility - Expiring August 2025
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,000
Line of credit facility, expiration period	3 years
Five Year Credit Facility - Expiring October 2024
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,200
Line of credit facility, expiration period	5 years
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 10,000