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 at Dec. 31, 2014			$ 6,688	$ 1,376	$ 1,221
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	$ 1,001
Net Income (Loss) Attributable to Parent	500
Other Comprehensive Income (Loss), Net of Tax	(628)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	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
Retained Earnings (Accumulated Deficit) at Dec. 31, 2016	2,158
Other Comprehensive Income (Loss), Net of Tax	129
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2016	722
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	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)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2017	2,112
Other Comprehensive Income (Loss), Net of Tax	301
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2017	1,023
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	$ 6,680	$ 6	$ 3,539	$ 2,112	$ 1,023