CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 53	$ 59
Accumulated depreciation	$ 23,158	$ 23,121
Preferred stock-non-redeemable, par value (in dollars per share)	$ 25.00	$ 25.00
Preferred stock-non-redeemable, shares authorized (in shares)	2,000	2,000
Preferred stock-non-redeemable, shares issued (in shares)	7	7
Preferred stock-non-redeemable, shares outstanding (in shares)	7	7
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,200,000	2,200,000
Common stock, shares issued (in shares)	1,026,860	1,014,768
Common stock, shares outstanding (in shares)	1,026,860	1,014,768