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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Impact of Accounting Policy Change (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011
Change in Accounting Principle [Line Items]
Change in Accounting Principle, Effect of Change on Net Income From Noncontrolling Interest			$ 4
Impact change in accounting principle [Member]
Change in Accounting Principle [Line Items]
Change in Accounting Principle Effect of Change on Basic Earnings Per Share from Continuing Operations	$ 0.02	$ (0.02)	$ 0.08
Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share from Continuing Operations	$ 0.02	$ (0.02)	$ 0.08
Change in accounting principle, cumulative effect on inventory				91
Change in accounting principle, cumulative effect on stockholder's equity				$ 45

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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