Income Taxes - Deferred Income Tax Assets and Liabilities (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Schedule Of Deferred Income Tax Assets And Liabilities [Line Items] | ||||||||||
Deferred tax assets, net operating losses | $ 53 | [1] | $ 47 | [1] | ||||||
Deferred tax assets, net operating losses | 427 | [2] | 289 | [2] | ||||||
Deferred tax assets, tax credits | 107 | [3] | 12 | [3] | ||||||
Net operating losses-stock-based compensation
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Schedule Of Deferred Income Tax Assets And Liabilities [Line Items] | ||||||||||
Deferred tax assets, net operating losses | 81 | 9 | ||||||||
Deferred tax assets, net operating losses | 2 | 2 | ||||||||
Deferred tax assets, tax credits | $ 227 | $ 146 | ||||||||
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