Other Comprehensive Income (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (89)	$ (70)	$ (73)	$ (63)
Other comprehensive (loss) income before reclassifications	(15)		(41)	(14)
Amounts reclassified from accumulated other comprehensive income (loss)	12	6	22	13
Other comprehensive (loss) income	(3)	6	(19)	(1)
AOCI distributed to QHC in spin-off	2		2
Accumulated Other Comprehensive Income (Loss), Ending Balance	(90)	(64)	(90)	(64)
Change in Fair Value of Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(67)	(52)	(48)	(43)
Other comprehensive (loss) income before reclassifications	(12)	2	(40)	(13)
Amounts reclassified from accumulated other comprehensive income (loss)	10	6	19	12
Other comprehensive (loss) income	(2)	8	(21)	(1)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(69)	(44)	(69)	(44)
Change in Fair Value of Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	3	8	1	7
Other comprehensive (loss) income before reclassifications	(3)	(2)	(1)	(1)
Amounts reclassified from accumulated other comprehensive income (loss)
Other comprehensive (loss) income	(3)	(2)	(1)	(1)
Accumulated Other Comprehensive Income (Loss), Ending Balance		6		6
Change in Unrecognized Pension Cost Components [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(25)	(26)	(26)	(27)
Amounts reclassified from accumulated other comprehensive income (loss)	2		3	1
Other comprehensive (loss) income	2		3	1
AOCI distributed to QHC in spin-off	2		2
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (21)	$ (26)	$ (21)	$ (26)