Investments (Schedule of Investments in Marketable Equity Securities and Other) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Successor [Member]
Finite-Lived Intangible Assets [Line Items]
Marketable equity securities	$ 45	$ 0
Equity method and other investments	92	0
Financial Instruments, Owned, Corporate Debt, at Fair Value	0	2,929
Derivative Asset	0	175
Total Investments	137	3,104
Predecessor [Member]
Finite-Lived Intangible Assets [Line Items]
Marketable equity securities		45
Equity method and other investments		1,008
Financial Instruments, Owned, Corporate Debt, at Fair Value		0
Derivative Asset		0
Total Investments		$ 1,053