Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions		Total		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance, beginning at Dec. 31, 2015		$ 16,593		$ 144	$ 7,868	$ 9,116	$ (750)	$ 215
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		594	[1]			656		(62)
Other comprehensive income (loss), net of tax		319					319
Compensation—restricted stock units					1	(1)
Other		6			2	(2)		6
Net change		919			3	653	319	(56)
Balance, ending at Sep. 30, 2016		17,512		144	7,871	9,769	(431)	159
Balance, beginning at Jun. 30, 2016							(390)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[2]	221
Other comprehensive income (loss), net of tax		(41)
Balance, ending at Sep. 30, 2016		17,512		144	7,871	9,769	(431)	159
Balance, beginning at Dec. 31, 2016		17,386		144	7,884	10,101	(896)	153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		731	[3]			756		(25)
Other comprehensive income (loss), net of tax		93					93
Compensation—restricted stock units		(26)			(26)
Issuance of common stock	[4]	402		3	321	78
Other		(7)		1				(8)
Net change		1,193		4	295	834	93	(33)
Balance, ending at Sep. 30, 2017		18,579		148	8,179	10,935	(803)	120
Balance, beginning at Jun. 30, 2017							(829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[5]	222
Other comprehensive income (loss), net of tax		26
Balance, ending at Sep. 30, 2017		$ 18,579		$ 148	$ 8,179	$ 10,935	$ (803)	$ 120

[1] The transferred IHC entities are not measured using a "market view" perspective.

[2] The transferred IHC entities are not measured using a "market view" perspective.

[3] The transferred IHC entities are not measured using a "market view" perspective.

[4] For additional information on the issuance of common stock, refer to Note 14.

[5] The transferred IHC entities are not measured using a "market view" perspective.