Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total short-term debt	$ 17,413,000,000	$ 18,658,000,000
Notes payable after one year	85,831,000,000	81,509,000,000
Unamortized discount	(18,000,000)	9,000,000
Unamortized debt issuance costs	(235,000,000)	(237,000,000)
Fair value adjustments	(1,044,000,000)	(1,258,000,000)
Total long-term debt	120,455,000,000	110,629,000,000
Debt	137,868,000,000	129,287,000,000
Debt Carrying Value Fair Value	$ 41,100,000,000	$ 38,700,000,000
Average Contractual (interest rate)	4.80%	4.80%
Average Effective (interest rate)	4.80%	4.80%
Fair value of short-term debt	$ 16,200,000,000	$ 15,500,000,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	7,000,000,000.0	5,800,000,000	$ 3,200,000,000
Discontinued Hedged Debt	(450,000,000)	(681,000,000)
Accounts Payable And Due To Affiliated Entities	1,684,000,000	1,592,000,000
Fixed Interest Rate [Member]
Debt Instrument [Line Items]
Notes payable after one year	69,085,000,000	64,655,000,000
Variable Interest Rate [Member]
Debt Instrument [Line Items]
Notes payable after one year	16,746,000,000	16,854,000,000
Floating Rate Demand Notes [Member]
Debt Instrument [Line Items]
Total short-term debt	12,040,000,000	10,907,000,000
Other short-term debt [Member]
Debt Instrument [Line Items]
Total short-term debt	4,173,000,000	4,593,000,000
Asset-backed Securities [Member]
Debt Instrument [Line Items]
Total short-term debt	1,200,000,000	3,158,000,000
Notes payable within one year	23,050,000,000	18,851,000,000
Notes payable after one year	36,224,000,000	$ 36,074,000,000
Debt	$ 60,474,000,000
Total short-term debt [Member]
Debt Instrument [Line Items]
Average Contractual (interest rate)	4.70%	5.30%
Average Effective (interest rate)	4.70%	5.30%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Notes payable within one year	$ 12,871,000,000	$ 11,755,000,000
Notes payable after one year	49,607,000,000	$ 45,435,000,000
Debt	$ 78,691,000,000
Total long-term debt [Member]
Debt Instrument [Line Items]
Average Contractual (interest rate)	4.80%	4.70%
Average Effective (interest rate)	4.80%	4.70%
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair value of debt	$ 140,046,000,000	$ 130,533,000,000
Affiliated Entity [Member]
Debt Instrument [Line Items]
Accounts Payable	723,000,000	693,000,000
Accounts and Financing Receivable, after Allowance for Credit Loss	$ 836,000,000	$ 845,000,000