Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Aug. 31, 2013	Dec. 31, 2012
Successor [Member] | Allowance for Doubtful Accounts, Current [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period		$ 6
Charges to earnings and equity	6	5
Balance at end of period	6	11
Successor [Member] | Allowance for Sales Returns [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period	3	3
Charges to earnings and equity	2	3
Amounts written off	2	3
Balance at end of period	3	3
Successor [Member] | Reserves for Doubtful Accounts and Sales Returns and Allowances, Current [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period	3	9
Charges to earnings and equity	8	8
Amounts written off	2	3
Balance at end of period	9	14
Successor [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period	1,273	953
Charges to earnings and equity	157	257
Amounts written off	477	83
Balance at end of period	953	1,127
Predecessor [Member] | Allowance for Doubtful Accounts, Current [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period			30	27
Charges to earnings and equity				12
Amounts written off			8	9
Balance at end of period			22	30
Predecessor [Member] | Allowance for Sales Returns [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period			5	11
Charges to earnings and equity			3	10
Amounts written off			5	16
Balance at end of period			3	5
Predecessor [Member] | Reserves for Doubtful Accounts and Sales Returns and Allowances, Current [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period			35	38
Charges to earnings and equity			3	22
Amounts written off			13	25
Balance at end of period			25	35
Predecessor [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Deducted in the Statement of Financial Position:
Balance at beginning of period			2,838	2,560
Charges to earnings and equity			180	807
Amounts written off			1,745	529
Balance at end of period			$ 1,273	$ 2,838