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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (3,131)	$ 896	$ 1,682
Other comprehensive income (loss):
Changes in net unrealized gain on securities	655	(3)	(1,091)
Changes in OTTI losses recognized in other comprehensive income	0	4	(2)
Changes in net gain on cash flow hedging instruments	(58)	(54)	(20)
Changes in foreign currency translation adjustments	28	61	(47)
Changes in pension and other postretirement plan adjustments	375	(16)	(97)
OCI, net of tax	1,000	(8)	(1,257)
Comprehensive (loss) income	$ (2,131)	$ 888	$ 425

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