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Per Share Information (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Per Share Information
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 180	$ 112	$ 294	$ 231
Dividends on preferred stock	28	0	57	0
Net income (loss) attributable to CCIC common stockholders for basic and diluted computations	$ 152	$ 112	$ 237	$ 231
Basic weighted-average number of common stock outstanding	415	364	412	363
Effect of assumed dilution from potential common shares relating to restricted stock units	1	2	1	1
Diluted weighted-average number of common shares outstanding	416	366	413	364
Basic	$ 0.37	$ 0.31	$ 0.58	$ 0.64
Diluted	$ 0.36	$ 0.31	$ 0.57	$ 0.64

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