Income Taxes (Federal Statutory Tax Rate And Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 401	$ 425	$ 258
Tax on non-U.S. earnings	20	(10)	(23)
State income taxes	17	(27)	(2)
Tax law changes	6	0	0
Other provisions	(1)	(7)	(17)
Valuation allowances	(3)	(60)	(237)
Section 199 deduction	(14)	(14)	(22)
Tax on undistributed non-U.S. earnings	(22)	30	51
Research credits	(27)	0	(11)
Tax benefit of repatriated non-U.S. earnings	(337)	0	0
Total income tax expense (benefit)	$ 40	$ 337	$ (3)