Variable Interest Entities (Carrying Amounts of Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Current assets	$ 52,916	$ 51,133
Total assets	164,864	162,861
Current liabilities	52,624	51,499
Total liabilities	101,520	100,903
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Current assets	11,468	10,315
Non-current assets	1,099	1,060
Total assets	12,567	11,375
Current liabilities	14,493	13,595
Non-current liabilities	132	140
Total liabilities	$ 14,625	$ 13,735