Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued	4,000,000	4,000,000
Preferred stock, shares outstanding	4,000,000	4,000,000
Common stock, shares authorized	115,000,000	115,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued	76,000,000	76,000,000
Common stock, shares outstanding	76,000,000	76,000,000
PAC
Common stock, shares authorized	750,000,000	750,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued	357,000,000	357,000,000
Common stock, shares outstanding	357,000,000	357,000,000
MEC
Common stock, shares authorized	350,000,000	350,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued	71,000,000	71,000,000
Common stock, shares outstanding	71,000,000	71,000,000
NPC
Common stock, shares authorized	1,000	1,000
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000
SPPC
Common stock, shares authorized	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 3.75	$ 3.75
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000