Consolidated Statements Of Capitalization (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Common stock, par value	$ 0.50	$ 0.50
Long-Term Debt Of Subsidiaries 8.00% To 8.99% [Member]
Maturity date	2025	2025
Long-Term Debt Of Subsidiaries 9.00% To 9.99% [Member]
Maturity date	2026	2026
Revolving Credit Agreement, Due 2027 [Member]
Maturity date	2027	2027
Notes At 2.40% Due 2031 [Member]
Interest rate	2.40%	2.40%
Maturity date	2031	2031
Notes At 2.704% Due 2030 [Member]
Interest rate	2.704%	2.704%
Maturity date	2030	2030
Notes at 5.375%, due 2034 [Member]
Interest rate	5.375%	5.375%
Maturity date	2034	2034
Notes At 4.28%, Due 2049 [Member]
Interest rate	4.28%	4.28%
Maturity date	2049	2049
Notes At 5.30%, Due 2052 [Member]
Interest rate	5.30%	5.30%
Maturity date	2052	2052
Notes at 5.95%, due 2024 through 2034 [Member]
Interest rate	5.95%	5.95%
Minimum [Member] \| Long-Term Debt Of Subsidiaries 0.00% To 0.99% [Member]
Interest rate	0.00%	0.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 1.00% To 1.99% [Member]
Interest rate	1.00%	1.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 2.00% To 2.99% [Member]
Interest rate	2.00%	2.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 3.00% To 3.99% [Member]
Interest rate	3.00%	3.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 4.00% To 4.99% [Member]
Interest rate	4.00%	4.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 5.00% To 5.99% [Member]
Interest rate	5.00%	5.00%
Maturity date	2024	2024
Minimum [Member] \| Long-Term Debt Of Subsidiaries 6.00% To 6.99% [Member]
Interest rate	6.00%	6.00%
Maturity date	2026	2026
Minimum [Member] \| Long-Term Debt Of Subsidiaries 7.00% To 7.99% [Member]
Interest rate	7.00%	7.00%
Maturity date	2025	2025
Minimum [Member] \| Long-Term Debt Of Subsidiaries 8.00% To 8.99% [Member]
Interest rate	8.00%	8.00%
Minimum [Member] \| Long-Term Debt Of Subsidiaries 9.00% To 9.99% [Member]
Interest rate	9.00%	9.00%
Minimum [Member] \| Notes Ranging From 3.01% To 3.59% Due 2029 Through 2050 [Member]
Interest rate	3.01%	3.01%
Maturity date	2029	2029
Minimum [Member] \| Notes at 5.95%, due 2024 through 2034 [Member]
Maturity date	2024	2024
Maximum [Member] \| Long-Term Debt Of Subsidiaries 0.00% To 0.99% [Member]
Interest rate	0.99%	0.99%
Maturity date	2033	2033
Maximum [Member] \| Long-Term Debt Of Subsidiaries 1.00% To 1.99% [Member]
Interest rate	1.99%	1.99%
Maturity date	2039	2039
Maximum [Member] \| Long-Term Debt Of Subsidiaries 2.00% To 2.99% [Member]
Interest rate	2.99%	2.99%
Maturity date	2058	2058
Maximum [Member] \| Long-Term Debt Of Subsidiaries 3.00% To 3.99% [Member]
Interest rate	3.99%	3.99%
Maturity date	2056	2056
Maximum [Member] \| Long-Term Debt Of Subsidiaries 4.00% To 4.99% [Member]
Interest rate	4.99%	4.99%
Maturity date	2059	2059
Maximum [Member] \| Long-Term Debt Of Subsidiaries 5.00% To 5.99% [Member]
Interest rate	5.99%	5.99%
Maturity date	2061	2061
Maximum [Member] \| Long-Term Debt Of Subsidiaries 6.00% To 6.99% [Member]
Interest rate	6.99%	6.99%
Maturity date	2036	2036
Maximum [Member] \| Long-Term Debt Of Subsidiaries 7.00% To 7.99% [Member]
Interest rate	7.99%	7.99%
Maturity date	2027	2027
Maximum [Member] \| Long-Term Debt Of Subsidiaries 8.00% To 8.99% [Member]
Interest rate	8.99%	8.99%
Maximum [Member] \| Long-Term Debt Of Subsidiaries 9.00% To 9.99% [Member]
Interest rate	9.99%	9.99%
Maximum [Member] \| Notes Ranging From 3.01% To 3.59% Due 2029 Through 2050 [Member]
Interest rate	3.59%	3.59%
Maturity date	2050	2050
Maximum [Member] \| Notes at 5.95%, due 2024 through 2034 [Member]
Maturity date	2034	2034