SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - STATEMENT OF COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statement of Income Captions [Line Items]
Net income	$ 1,463	$ 4,105	$ 2,362
Total other comprehensive (loss) income	171	422	(140)
Pretax amount
Condensed Statement of Income Captions [Line Items]
Net income	1,417	5,368	2,585
Foreign currency translation adjustments	(6)	547	(43)
Financial instruments	191	(146)	(161)
Pension and other postretirement benefits	28	11	25
Total other comprehensive (loss) income	213	412	(179)
Total comprehensive income, after preferred dividends of subsidiaries	1,629	5,779	2,405
Income tax benefit (expense)
Condensed Statement of Income Captions [Line Items]
Net income	(99)	(1,435)	(387)
Foreign currency translation adjustments	0	0	0
Financial instruments	(47)	33	53
Pension and other postretirement benefits	(6)	1	(7)
Total other comprehensive (loss) income	(53)	34	46
Total comprehensive income, after preferred dividends of subsidiaries	(152)	(1,401)	(341)
Net-of-tax amount
Condensed Statement of Income Captions [Line Items]
Net income	1,318	3,933	2,198
Foreign currency translation adjustments	(6)	547	(43)
Financial instruments	144	(113)	(108)
Pension and other postretirement benefits	22	12	18
Total other comprehensive (loss) income	160	446	(133)
Total comprehensive income, after preferred dividends of subsidiaries	1,477	4,378	2,064
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income	1,317	3,932	2,197
Parent Company | Pretax amount
Condensed Statement of Income Captions [Line Items]
Net income	1,127	3,756	2,034
Foreign currency translation adjustments	(6)	547	(43)
Financial instruments	191	(146)	(161)
Pension and other postretirement benefits	28	11	25
Total other comprehensive (loss) income	213	412	(179)
Total comprehensive income, after preferred dividends of subsidiaries	1,340	4,168	1,855
Parent Company | Income tax benefit (expense)
Condensed Statement of Income Captions [Line Items]
Net income	190	176	163
Foreign currency translation adjustments	0	0	0
Financial instruments	(47)	33	53
Pension and other postretirement benefits	(6)	1	(7)
Total other comprehensive (loss) income	(53)	34	46
Total comprehensive income, after preferred dividends of subsidiaries	137	210	209
Parent Company | Net-of-tax amount
Condensed Statement of Income Captions [Line Items]
Net income	1,317	3,932	2,197
Foreign currency translation adjustments	(6)	547	(43)
Financial instruments	144	(113)	(108)
Pension and other postretirement benefits	22	12	18
Total other comprehensive (loss) income	160	446	(133)
Total comprehensive income, after preferred dividends of subsidiaries	$ 1,477	$ 4,378	$ 2,064