Consolidated Statement of Shareholder's Interest - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total shareholder’s interest	$ 13,389	$ 11,877	$ 12,398	$ 15,567
Shareholder's Interest [Roll Forward]
Balance at beginning of period	11,877
Net income	1,324	1,989	4,521
Other comprehensive income/(loss), net of tax	188	(327)	(212)
Stockholders' Equity, Other		(83)	22
Balance at end of period	13,389	11,877
Stockholders' interest attributable to noncontrolling interest	0	0
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	5,166	5,227	5,227
Other comprehensive income/(loss), net of tax	0	0	0
Distributions declared	0	0	0
Stockholders' Equity, Other		(61)	0
Balance at end of period	5,166	5,166	5,227
Accumulated Other Comprehensive Income/(Loss) (Note11) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	(1,017)	(690)	(478)
Net income	0	0	0
Other comprehensive income/(loss), net of tax	188	(327)	(212)
Distributions declared	0	0	0
Stockholders' Equity, Other		0	0
Balance at end of period	(829)	(1,017)	(690)
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	7,728	7,839	10,818
Net income	1,324	1,989	4,521
Other comprehensive income/(loss), net of tax	0	0	0
Distributions declared	0	2,100	7,500
Stockholders' Equity, Other		0	0
Balance at end of period	9,052	7,728	7,839
Parent [Member]
Total shareholder’s interest			12,376	15,567
Shareholder's Interest [Roll Forward]
Balance at beginning of period	11,877
Net income	0	0	0
Distributions declared	0	(2,100)	(7,500)
Stockholders' Equity, Other		61	0
Balance at end of period	13,389	11,877
Noncontrolling Interest [Member]
Total shareholder’s interest			22
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)	$ 22
Stockholders' interest attributable to noncontrolling interest	$ 0	$ 0		$ 0