Consolidated Statement of Shareholder's Interest - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021
Shareholder's Interest [Roll Forward]
Balance at beginning of period		$ 11,877			$ 11,877
Net income	$ 286	240	$ 804	$ 669	526	$ 1,473
Other Comprehensive Income (Loss), Net of Tax	18	88	(367)	152
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance	12,205	11,877	12,136	12,398	11,877	12,398
Distributions declared	0	0	(600)	(1,000)
Stockholders' Equity, Other				(83)
Balance at end of period	12,509				12,509
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	12,509	12,205	11,973	12,136	12,509	11,973
SHAREHOLDER’S INTEREST	0				0
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	5,166	5,166	5,166	5,227	5,166	5,227
Net income	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0	0	0
Distributions declared	0	0	0	0
Stockholders' Equity, Other				(61)
Balance at end of period	5,166	5,166	5,166	5,166	5,166	5,166
Accumulated Other Comprehensive Income/(Loss) (Note11) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	(929)	(1,017)	(538)	(690)	(1,017)	(690)
Net income	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	18	88	(367)	152
Distributions declared	0	0	0	0
Stockholders' Equity, Other				0
Balance at end of period	(911)	(929)	(905)	(538)	(911)	(905)
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	7,968	7,728	7,508	7,839	7,728	7,839
Other Comprehensive Income (Loss), Net of Tax	0	0	0	0
Distributions declared	0	0	(600)	(1,000)
Stockholders' Equity, Other				0
Balance at end of period	8,254	7,968	7,712	7,508	8,254	7,712
Noncontrolling Interest
Shareholder's Interest [Roll Forward]
Net income	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0	0	0
Distributions declared	0	0	0	0
Stockholders' Equity, Other				(22)
SHAREHOLDER’S INTEREST	0	0	0	0	0	0	$ 22
Parent [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	12,205
Net income	286	240	804	669
Other Comprehensive Income (Loss), Net of Tax	18	88	(367)	152
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance			12,136	12,376		12,376
Distributions declared	0	0	(600)	(1,000)
Stockholders' Equity, Other				(61)
Balance at end of period	$ 12,509	$ 12,205			$ 12,509
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance			$ 11,973	$ 12,136		$ 11,973