SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 5,061	$ 3,394
Investment securities	13,881	13,192
Other current assets	5,567	6,493
Total current assets	26,183	24,893
Property and equipment, net	3,221	3,073
Other long-term assets	3,380	4,379
Total assets	43,055	44,358
Current liabilities:
Short-term debt	2,092	1,953
Book overdraft	298	326
Total current liabilities	17,178	15,331
Long-term debt	9,034	10,541
Other long-term liabilities	1,473	2,383
Total liabilities	27,685	28,255
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; 198,666,598 shares issued at December 31, 2022 and 198,648,742 shares issued at December 31, 2021	33	33
Capital in excess of par value	3,246	3,082
Retained earnings	25,492	23,086
Accumulated other comprehensive (loss) income	(1,304)	42
Treasury stock, at cost, 73,691,955 shares at December 31, 2022 and 69,846,758 shares at December 31, 2021	(12,156)	(10,163)
Total stockholders' equity	15,311	16,080
Total liabilities and equity	43,055	44,358
Parent Company
Current assets:
Cash and cash equivalents	614	906
Investment securities	320	428
Receivable from operating subsidiaries	1,807	1,316
Other current assets	577	545
Total current assets	3,318	3,195
Property and equipment, net	2,393	2,223
Investment in subsidiaries	27,905	26,885
Other long-term assets	282	666
Total assets	33,898	32,969
Current liabilities:
Payable to operating subsidiaries	5,421	2,056
Short-term debt	2,092	1,953
Current portion of notes payable to operating subsidiaries	36	36
Book overdraft	73	68
Other current liabilities	1,425	1,460
Total current liabilities	9,047	5,573
Long-term debt	9,034	10,541
Other long-term liabilities	506	775
Total liabilities	18,587	16,889
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; 198,666,598 shares issued at December 31, 2022 and 198,648,742 shares issued at December 31, 2021	33	33
Capital in excess of par value	3,246	3,082
Retained earnings	25,492	23,086
Accumulated other comprehensive (loss) income	(1,304)	42
Treasury stock, at cost, 73,691,955 shares at December 31, 2022 and 69,846,758 shares at December 31, 2021	(12,156)	(10,163)
Total stockholders' equity	15,311	16,080
Total liabilities and equity	$ 33,898	$ 32,969