Note 8: Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		35.00%		35.00%	35.00%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 123
Recognition Revenue Reductions	61
Deferred Tax Assets, Valuation Allowance		16	23	16	23
Deferred Tax Liabilities, Net		296	115	296	115
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued			25		25
Deferred Federal Income Tax Expense (Benefit)			50
Deferred Tax Assets, Net		2	246	2	246
Deferred Income Tax Expense (Benefit)		$ 23		$ 16	$ 38