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Loans Payable, Long-Term Debt and Leases - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, current maturities		$ 1,300,000,000	$ 1,700,000,000
Loans payable and current portion of long-term debt		1,372,000,000	$ 1,946,000,000
Long-term debt, maturities, repayments of principal in 2024		1,400,000,000
Long-term debt, maturities, repayments of principal in 2025		2,500,000,000
Long-term debt, maturities, repayments of principal in 2026		2,200,000,000
Long-term debt, maturities, repayments of principal in 2027		1,500,000,000
Long-term debt, maturities, repayments of principal in 2028		2,100,000,000
Long-term debt, interest payments in 2024		1,200,000,000
Long-term debt, interest payments in 2025		1,100,000,000
Long-term debt, interest payments in 2026		1,100,000,000
Long-term debt, interest payments in 2027		1,000,000,000
Long-term debt, interest payments in 2028		1,000,000,000
Available borrowing capacity under credit facility		$ 6,000,000,000
Operating lease, weighted average remaining lease term		7 years	7 years
Operating lease, cost		$ 339,000,000	$ 334,000,000	$ 343,000,000
Operating lease, payments		347,000,000	335,000,000	340,000,000
Right-of-use asset obtained in exchange for operating lease liability		122,000,000	$ 57,000,000	$ 117,000,000
Lessee, operating lease, lease not yet commenced, amount		$ 188,000,000
Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 6,000,000,000
Proceeds from issuance of debt	5,900,000,000
Other Variable Rate Debt
Debt Instrument [Line Items]
Effective interest rate		4.82%	1.40%
6.30% debentures due 2026
Debt Instrument [Line Items]
Stated interest rate		6.30%
4.05% notes due 2028
Debt Instrument [Line Items]
Stated interest rate		4.05%
4.05% notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 500,000,000
Stated interest rate	4.05%
4.30% notes due 2030
Debt Instrument [Line Items]
Stated interest rate		4.30%
4.30% notes due 2030 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 750,000,000
Stated interest rate	4.30%
4.50% notes due 2033
Debt Instrument [Line Items]
Stated interest rate		4.50%
4.50% notes due 2033 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,500,000,000
Stated interest rate	4.50%
4.90% notes due 2044
Debt Instrument [Line Items]
Stated interest rate		4.90%
4.90% notes due 2044 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 750,000,000
Stated interest rate	4.90%
5.00% notes due 2053
Debt Instrument [Line Items]
Stated interest rate		5.00%
5.00% notes due 2053 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,500,000,000
Stated interest rate	5.00%
5.15% notes due 2063
Debt Instrument [Line Items]
Stated interest rate		5.15%
5.15% notes due 2063 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,000,000,000
Stated interest rate	5.15%
Notes Subject To Repayment At Option Of Holder
Debt Instrument [Line Items]
Loans payable and current portion of long-term debt		$ 69,000,000	$ 197,000,000
Commercial paper
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper		5.14%	0.65%
Buildings
Debt Instrument [Line Items]
Operating lease, weighted average remaining lease term		7 years
Lessee, operating lease, renewal term		5 years
Vehicles
Debt Instrument [Line Items]
Operating lease, weighted average remaining lease term		4 years