Debt (Schedule of Debt Activity) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Issuance of Notes and Debentures:
Net commercial paper borrowings	$ 0	$ (2,686)	$ 262	$ 428	$ (1,996)
Repayment of long-term debt	3,184	203	2,225	4,685	10,297	$ 12,044	$ 25,118
Line of Credit
Issuance of Notes and Debentures:
Repayment of long-term debt	142	203	136	204	685
USD notes
Issuance of Notes and Debentures:
Repayment of long-term debt	2,575	0	1,615	2,300	6,490
Euro Member Countries, Euro | Foreign notes
Issuance of Notes and Debentures:
Repayment of long-term debt	0	0	32	2,181	2,213
Australia, Dollars | Foreign notes
Issuance of Notes and Debentures:
Repayment of long-term debt	0	0	442	0	442
Switzerland, Francs | Foreign notes
Issuance of Notes and Debentures:
Repayment of long-term debt	$ 467	$ 0	$ 0	$ 0	$ 467