SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 4,694	$ 5,061
Investment securities	16,626	13,881
Receivables, net of allowances of $88 in 2023 and $70 in 2022	2,035	1,674
Other current assets	6,631	5,567
Total current assets	29,986	26,183
Property and equipment, net	3,030	3,221
Other long-term assets	3,377	3,380
Total assets	47,065	43,055
Current liabilities:
Short-term debt	1,443	2,092
Book overdraft	353	298
Total current liabilities	18,872	17,178
Long-term debt	10,213	9,034
Other long-term liabilities	1,662	1,473
Total liabilities	30,747	27,685
Commitments and contingencies (Note 17)
Stockholders' Equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,690,082 shares issued at December 31, 2023 and 198,666,598 shares issued at December 31, 2022	33	33
Capital in excess of par value	3,346	3,246
Retained earnings	27,540	25,492
Accumulated other comprehensive loss	(999)	(1,304)
Treasury stock, at cost, 76,465,862 shares at December 31, 2023 and 73,691,955 shares at December 31, 2022	(13,658)	(12,156)
Total stockholders' equity	16,262	15,311
Total liabilities and equity	47,065	43,055
Parent Company
Current assets:
Cash and cash equivalents	250	614
Investment securities	260	320
Other current assets	717	577
Total current assets	3,277	3,318
Property and equipment, net	2,334	2,393
Investment in subsidiaries	29,666	27,905
Other long-term assets	348	282
Total assets	35,625	33,898
Current liabilities:
Short-term debt	1,443	2,092
Book overdraft	75	73
Other current liabilities	1,566	1,425
Total current liabilities	8,888	9,047
Long-term debt	10,213	9,034
Other long-term liabilities	262	506
Total liabilities	19,363	18,587
Commitments and contingencies (Note 17)
Stockholders' Equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,690,082 shares issued at December 31, 2023 and 198,666,598 shares issued at December 31, 2022	33	33
Capital in excess of par value	3,346	3,246
Retained earnings	27,540	25,492
Accumulated other comprehensive loss	(999)	(1,304)
Treasury stock, at cost, 76,465,862 shares at December 31, 2023 and 73,691,955 shares at December 31, 2022	(13,658)	(12,156)
Total stockholders' equity	16,262	15,311
Total liabilities and equity	35,625	33,898
Parent Company | Subsidiaries
Current assets:
Receivables, net of allowances of $88 in 2023 and $70 in 2022	2,050	1,807
Current liabilities:
Payable to operating subsidiaries	5,768	5,421
Current portion of notes payable to operating subsidiaries	$ 36	$ 36