Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Research and Development Expense	$ 390	$ 370	$ 369
Advertising Expense	408	435	471
Maximum Cash Investments With Single Counterparty	450
Capital Lease Obligations Incurred	19	41	17
Capitalized Costs Incurred	18	126	38
Change in Accrual for Capital Expenditures	42
Restricted Net Assets	768
Depreciation	$ 719	$ 684	$ 711