Consolidated Statements of Change in Equity, AOCI (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest in Consolidated Subsidiaries [Member]	Redeemable Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2013	$ 12,381	$ 1	$ (53)	$ 9,794	$ 2,482	$ 125	$ 32	$ 322
Beginning Balance, Shares at Dec. 31, 2013		115	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	(171)					(171)
Exercise of common stock options	13			13
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(45)		(45)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises, Shares			0
Stock-based compensation	105			105
Issuance of restricted stock		1
Tax benefits from stock option plans	26			26
Adjustment to redemption value of redeemable non-controlling interest	46				46			(46)
Acquisition of redeemable non-controlling interest	16
Distributions of profits to non-controlling interest	(17)						(17)
Treasury shares retired in connection with formation of ICE Group, Shares		0	0
Treasury shares retired in connection with formation of ICE Group			0	0	0
Dividends paid to shareholders	(299)
Net income attributable to non-controlling interest	(18)				(35)		17	18
Net income	1,016				1,016
Ending Balance at Dec. 31, 2014	12,392	1	(743)	9,938	3,210	(46)	32	165
Ending Balance, Shares at Dec. 31, 2014	116	116	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	(107)					(107)
Exercise of common stock options	4			4
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(36)		(36)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises, Shares			0
Stock-based compensation	28			28
Issuance of restricted stock		0
Tax benefits from stock option plans	13			13
Adjustment to redemption value of redeemable non-controlling interest	(11)				(11)			7
Acquisition of redeemable non-controlling interest	0
Distributions of profits to non-controlling interest	(8)						(8)
Purchase of subsidiary shares from non-controlling interest	0			0			0
Dividends paid to shareholders	(73)
Net income attributable to non-controlling interest	(4)				(8)		4	4
Net income	323				323
Ending Balance at Mar. 31, 2015	$ 12,325	$ 1	$ (975)	$ 9,983	$ 3,441	$ (153)	$ 28	$ 169
Ending Balance, Shares at Mar. 31, 2015	0	116	(4)