Other Comprehensive Income (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (90)	$ (64)	$ (73)	$ (63)
Other comprehensive (loss) income before reclassifications	(7)	(36)	(48)	(49)
Amounts reclassified from accumulated other comprehensive income (loss)	10	7	32	19
Other comprehensive income (loss)	3	(29)	(16)	(30)
AOCI distributed to QHC in spin-off			2
Accumulated Other Comprehensive Income (Loss), Ending Balance	(87)	(93)	(87)	(93)
Change in Fair Value of Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(69)	(44)	(48)	(43)
Other comprehensive (loss) income before reclassifications		(27)	(40)	(39)
Amounts reclassified from accumulated other comprehensive income (loss)	10	6	29	17
Other comprehensive income (loss)	10	(21)	(11)	(22)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(59)	(65)	(59)	(65)
Change in Fair Value of Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		6	1	7
Other comprehensive (loss) income before reclassifications	(7)	(9)	(8)	(10)
Amounts reclassified from accumulated other comprehensive income (loss)
Other comprehensive income (loss)	(7)	(9)	(8)	(10)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(7)	(3)	(7)	(3)
Change in Unrecognized Pension Cost Components [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(21)	(26)	(26)	(27)
Amounts reclassified from accumulated other comprehensive income (loss)		1	3	2
Other comprehensive income (loss)		1	3	2
AOCI distributed to QHC in spin-off			2
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (21)	$ (25)	$ (21)	$ (25)