Schedule II (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Bad Debts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Jan. 1		$ 128	$ 122	$ 106
Charged to costs and expenses		64	79	73
Charged to other accounts	[1]	16	13	26
Deductions from reserves	[2]	97	86	83
Balance at Dec. 31		111	128	122
NOL and Tax Credit Valuation Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Jan. 1		70	62	64
Charged to costs and expenses		45	26	6
Charged to other accounts		0	0	0
Deductions from reserves	[3]	42	18	8
Balance at Dec. 31		$ 73	$ 70	$ 62

[1] Recovery of amounts previously written-off.

[2] Deductions related primarily to bad debt write-offs.

[3] Primarily reversals of valuation allowances on completed tax credit sales and reductions of valuation allowances for items forecasted to be used prior to expiration