v2.4.0.8
Income Taxes Income Tax Unusual or Infrequent Items (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Her Majesty's Revenue and Customs (HMRC) [Member]
Foreign Tax Authority [Member]
Sep. 30, 2013
Her Majesty's Revenue and Customs (HMRC) [Member]
Foreign Tax Authority [Member]
Sep. 30, 2013
Her Majesty's Revenue and Customs (HMRC) [Member]
Foreign Tax Authority [Member]
Mar. 31, 2015
Her Majesty's Revenue and Customs (HMRC) [Member]
Foreign Tax Authority [Member]
Mar. 31, 2016
Her Majesty's Revenue and Customs (HMRC) [Member]
Subsequent Event [Member]
Foreign Tax Authority [Member]
Schedule of Income Tax Expense Benefit Unusual or Infrequent Items [Line Items]                  
Corporate Income Tax Rate         23.00%     21.00% 20.00%
Tax Credits (1) $ 0 [1] $ 0 [1] $ (2) [1] $ (22) [1]          
Witholding Taxes (2) 0 [2] (1) [2] (1) [2] 3 [2]          
Other Change in Tax Reserves (3) 0 [3] (6) [3] (6) [3] (5) [3]          
Change in tax law (4) 0 [4] 12 [4] 0 [4] 12 [4]   12 [4] 12 [4]    
Other Adjustments (5) (7) [5] 8 [5] (11) [5] 6 [5]          
Income Tax Expense (Benefit) associated with unusual or infrequent items $ (7) $ 13 $ (20) $ (6)          
[1] For the nine months ended September 30, 2013, the tax benefit primarily relates to the retroactive reinstatement of the U.S research and development tax credit under The American Taxpayer Relief Act of 2012.
[2] For the nine months ended September 30, 2014 and September 30, 2013, the tax benefits and expense, respectively, primarily relate to the adjustment of the withholding tax liability on the undistributed earnings of certain foreign subsidiaries that are not indefinitely reinvested.
[3] For the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013, the tax benefits primarily relate to adjustments in tax reserves which were individually insignificant.
[4] For the three and nine months ended September 30, 2013, the tax expense relates to the enactment of the United Kingdom Finance Act 2013 on July 23, 2013, which provided for a reduction to the corporate income tax rate from 23% to 21% effective April 1, 2014, with a further reduction to 20% effective April 1, 2015. The impact of this legislation was recorded as a discrete item during the third quarter of 2013, and resulted in increased tax expense of approximately $12 million due to the resultant impact on the net deferred tax asset balances.
[5] For the three and nine months ended September 30, 2014 and September 30, 2013, the tax benefits and expense, respectively, primarily relate to provision to return adjustments and other items which were individually insignificant.