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Income Taxes Income Tax Expense & Effective Tax Rate (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
|
Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Schedule of Income Taxes [Line Items] | ||||||||||
| Income Tax Expense (Benefit) | $ 63 | $ 72 | $ 200 | $ 182 | ||||||
| Effective Income Tax Rate, Percent | 16.00% | 20.00% | 16.00% | 16.00% | ||||||
| Change in Enacted Tax Rate, Amount | 0 | [1] | 12 | [1] | 0 | [1] | 12 | [1] | ||
| Cash Taxes Paid | 237 | 215 | ||||||||
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Her Majesty's Revenue and Customs (HMRC) [Member] | Foreign Tax Authority [Member]
|
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| Schedule of Income Taxes [Line Items] | ||||||||||
| Change in Enacted Tax Rate, Amount | $ 12 | [1] | $ 12 | [1] | ||||||
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