Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	$ (163)	$ (124)	$ (157)
Amounts arising during the year	(21)	(40)	12
Reclassifications from AOCI	0	1	21
Net OCI during the year	(21)	(39)	33
Balance at end of year	(184)	(163)	(124)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	0	0	0
Amounts arising during the year	0	0	0
Reclassifications from AOCI	0	0	0
Net OCI during the year	0	0	0
Balance at end of year	0	0	0
Qualifying Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	6	3	1
Amounts arising during the year	0	0	0
Reclassifications from AOCI	3	3	2
Net OCI during the year	3	3	2
Balance at end of year	9	6	3
Equity Investees AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	3	2	0
Amounts arising during the year	1	1	2
Reclassifications from AOCI	0	0	0
Net OCI during the year	1	1	2
Balance at end of year	4	3	2
Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(4)	(5)	(6)
Amounts arising during the year	0	0	(1)
Reclassifications from AOCI	1	1	2
Net OCI during the year	1	1	1
Balance at end of year	(3)	(4)	(5)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(168)	(124)	(152)
Amounts arising during the year	(22)	(41)	11
Reclassifications from AOCI	(4)	(3)	17
Net OCI during the year	(26)	(44)	28
Balance at end of year	$ (194)	$ (168)	$ (124)