SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,559	$ 3,121	$ 2,830	$ 2,536	$ 2,555	$ 3,075	$ 2,708	$ 2,437	$ 5,366	$ 5,145	$ 8,487	$ 8,220	$ 11,046	$ 10,775	$ 9,013
Expenses:
Selling, general and administrative	245	303	264	276	234	282	287	250	541	537	845	819	1,088	1,053	978
Interest expense, net of interest income	164	164	164	156	171	179	182	175	320	357	484	536	648	707	647
Other (income) expense, net	6	3	(21)	(3)	21	83	(2)	0	(24)	(2)	(21)	81	(15)	102	34
Total expenses	2,843	2,918	2,709	2,598	2,516	2,763	2,516	2,378	5,308	4,893	8,226	7,657	11,069	10,172	8,648
Income (loss) before income taxes	(284)	203	121	(62)	39	312	192	59	58	252	261	563	(23)	603	365
Provision for taxes on income (loss)	50	(54)	(49)	(7)	(57)	(110)	(81)	(53)	(56)	(135)	(109)	(243)	(59)	(301)	(181)
Net income (loss)	$ (234)	$ 149	$ 72	$ (69)	$ (18)	$ 202	$ 111	$ 6	$ 2	$ 117	$ 152	$ 320	(82)	302	184
Parent
Condensed Financial Statements, Captions [Line Items]
Revenues													0	0	0
Expenses:
Selling, general and administrative													0	0	0
Interest expense, net of interest income													6	37	53
Other (income) expense, net													1	39	0
Total expenses													7	76	53
Income (loss) before income taxes													(7)	(76)	(53)
Provision for taxes on income (loss)													3	28	20
Equity in earnings (loss) of subsidiaries, net of tax													(78)	350	217
Net income (loss)													$ (82)	$ 302	$ 184