Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Abstract]
Current income taxes	$ 47	$ 13	$ 0
Deferred Other Tax Expense (Benefit)	(427)	1,110	1,110
Total Income Tax Expense (Benefit)	$ (380)	$ 1,123	$ 1,110