CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions		Total	Common Stock Class A	Common Stock Class B	Treasury Stock Class A	Additional Paid-In Capital	Accumulated Loss	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2015			180	719	0
Beginning balance at Dec. 31, 2015		$ 3,660	$ 2	$ 7	$ 0	$ 12,910	$ (11,032)	$ (1,219)	$ 2,992
Increase (Decrease) in Stockholders' Equity
Dividends and distributions paid to noncontrolling interests	[1]	(141)							(141)
Net income	[2]	192					96		96
Other comprehensive (loss) income		(105)						(106)	1
Adjustment to redemption value of redeemable noncontrolling interest		4				4
Stock compensation expense		171				171
Stock activity under stock compensation plans and other (in shares)			162	(150)	5
Stock activity under stock compensation plans and other		(36)	$ 1	$ (1)	$ (58)	22
Ending balance (in shares) at Jun. 30, 2016			342	569	(5)
Ending balance at Jun. 30, 2016		3,745	$ 3	$ 6	$ (58)	13,107	(10,936)	(1,325)	2,948
Increase (Decrease) in Stockholders' Equity
Other comprehensive (loss) income		(41)
Ending balance (in shares) at Jun. 30, 2016			342	569	(5)
Ending balance at Jun. 30, 2016		3,745	$ 3	$ 6	$ (58)	13,107	(10,936)	(1,325)	2,948
Beginning balance (in shares) at Dec. 31, 2016			367	544	(5)
Beginning balance at Dec. 31, 2016		4,131	$ 4	$ 5	$ (61)	13,210	(10,612)	(1,326)	2,911
Increase (Decrease) in Stockholders' Equity
Dividends and distributions paid to noncontrolling interests	[1]	(110)							(110)
Net income	[2]	306					221		85
Other comprehensive (loss) income		126						119	7
Adjustment to redemption value of redeemable noncontrolling interest		1				1
Stock compensation expense		121				121
Stock activity under stock compensation plans and other (in shares)			12	(1)	5
Stock activity under stock compensation plans and other		(47)			$ (77)	30
Ending balance (in shares) at Jun. 30, 2017			379	543	(10)
Ending balance at Jun. 30, 2017		4,528	$ 4	$ 5	$ (138)	13,362	(10,391)	(1,207)	2,893
Increase (Decrease) in Stockholders' Equity
Other comprehensive (loss) income		35
Ending balance (in shares) at Jun. 30, 2017			379	543	(10)
Ending balance at Jun. 30, 2017		$ 4,528	$ 4	$ 5	$ (138)	$ 13,362	$ (10,391)	$ (1,207)	$ 2,893

[1] The total distribution presented in the unaudited consolidated statements of equity for the six months ended June 30, 2017 and 2016 excludes $16 million in distributions paid to redeemable noncontrolling interest not included in equity.

[2] The total net income presented in the unaudited consolidated statements of equity for the six months ended June 30, 2017 and 2016 is $16 million and $17 million lower, respectively, than the amounts presented in the unaudited consolidated statements of operations due to the net income attributable to the redeemable noncontrolling interest not included in equity.