Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	$ 8,162	$ 6	$ 5,687	$ 1,876	$ 593
Stockholders' Equity Attributable to Parent	8,162	6	5,687	1,876	593
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings			(752)
Net Income (Loss) Attributable to Parent	282			282
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					129
Stockholders' Equity Attributable to Parent	7,821	6	4,935	2,158	722
Stockholders' Equity Attributable to Parent	7,821	6	4,935	2,158	722
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings			(1,396)
Net Income (Loss) Attributable to Parent	(46)			(46)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					301
Retained Earnings (Accumulated Deficit) at Dec. 31, 2017	2,112
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2017	1,023
Stockholders' Equity Attributable to Parent	6,680	6	3,539	2,112	1,023
Cumulative Effect of New Accounting Principle in Period of Adoption				(182)	182
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance				1,930	1,205
Stockholders' Equity Attributable to Parent	6,680	6	3,539	2,112	1,023
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings			(619)
Net Income (Loss) Attributable to Parent	94			94
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(447)
Adjustment to APIC, Contribution from Parent	102
Retained Earnings (Accumulated Deficit) at Dec. 31, 2018	409
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2018	(171)
Stockholders' Equity Attributable to Parent	5,810	6	3,022	2,024	758
Stockholders' Equity Attributable to Parent	5,810	6	3,022	2,024	758
Net Income (Loss) Attributable to Parent	409			409
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(171)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2018	409
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2018	(171)
Stockholders' Equity Attributable to Parent	2,005	6	1,761	409	(171)
Stockholders' Equity Attributable to Parent	$ 2,005	$ 6	$ 1,761	$ 409	$ (171)