Consolidated Statement of Shareholder's Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2015	$ 2,119	$ 0	$ 161	$ (1,156)	$ 3,114
Net income (loss)	197				197
Other comprehensive income (loss)	(107)			(107)
Ending balance at Dec. 31, 2016	2,209	0	161	(1,263)	3,311
Net income (loss)	(603)				(603)
Other comprehensive income (loss)	265			265
Ending balance at Dec. 31, 2017	1,871	0	161	(998)	2,708
Net income (loss)	387				387
Other comprehensive income (loss)	(62)			(62)
Ending balance at Dec. 31, 2018	$ 2,196	$ 0	$ 161	$ (1,060)	$ 3,095