Supplemental Cash Flow Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Line Items]
Cash paid for interest	$ 349,000,000	$ 707,000,000	$ 360,000,000
Cash paid for income taxes	283,000,000	259,000,000	386,000,000
Payment associated with early extinguishment of debt mainly for early redemption premiums		360,000,000
Non-cash investing and financing activities:
Shares received in Split-Off	0	2,721,000,000	0
Equipment acquired under capitalized leases	3,000,000	1,000,000	58,000,000
Radio station swap (Note 3)	0	262,000,000	0
Continuing Operations [Member]
Supplemental Cash Flow Information [Line Items]
Cash paid for income taxes	258,000,000	217,000,000	294,000,000
Discontinued Operations [Member]
Supplemental Cash Flow Information [Line Items]
Cash paid for income taxes	$ 25,000,000	$ 42,000,000	$ 92,000,000