Consolidated Balance Sheets (Unaudited) - PAC (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2024	Dec. 31, 2023
Common stock, shares authorized (in shares)	115	115
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	76	76
Common stock, shares outstanding (in shares)	76	76
PAC
Common stock, shares authorized (in shares)	750	750
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	357	357
Common stock, shares outstanding (in shares)	357	357