Consolidated Statement of Shareholder's Interest - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total shareholder’s interest	$ 13,757	$ 13,389	$ 11,877	$ 12,398
Shareholder's Interest [Roll Forward]
Balance at beginning of period	13,389
Net income	1,256	1,324	1,989
Other comprehensive income/(loss), net of tax	(388)	188	(327)
Stockholders' Equity, Other			(83)
Balance at end of period	13,757	13,389
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	5,166	5,166	5,227
Other comprehensive income/(loss), net of tax	0	0	0
Distributions declared	0	0	0
Stockholders' Equity, Other			(61)
Balance at end of period	5,166	5,166	5,166
Accumulated Other Comprehensive Income/(Loss) (Note11) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	(829)	(1,017)	(690)
Net income	0	0	0
Other comprehensive income/(loss), net of tax	(388)	188	(327)
Distributions declared	0	0	0
Stockholders' Equity, Other			0
Balance at end of period	(1,217)	(829)	(1,017)
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	9,052	7,728	7,839
Net income	1,256	1,324	1,989
Other comprehensive income/(loss), net of tax	0	0	0
Distributions declared	500	0	2,100
Stockholders' Equity, Other			0
Balance at end of period	9,808	9,052	7,728
Parent [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	13,389	11,877	12,376
Net income	0	0	0
Distributions declared	(500)	0	(2,100)
Stockholders' Equity, Other			(61)
Balance at end of period	13,757	13,389	11,877
Noncontrolling Interest [Member]
Shareholder's Interest [Roll Forward]
Net income	0	0	0
Other comprehensive income/(loss), net of tax	0	0	0
Distributions declared	0	0	0
Stockholders' Equity, Other			(22)
Stockholders' interest attributable to noncontrolling interest	$ 0	$ 0	$ 0	$ 22