Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income (loss)	$ 32	$ 125
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive income	384	(196)
Accumulated Net Unrealized Investment Gain (Loss)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
OCI, net of tax	354	(304)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
OCI, net of tax	0	(18)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
OCI, net of tax	(2)	1
AOCI Attributable to Parent [Member]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
OCI, net of tax	$ 352	$ (321)