v2.4.0.8
Schedule of Valuation and Qualifying Accounts Disclosure (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 6 $ 13 $ 2
Charged to Expense 4 (1) 7
Deductions 0 [1] (5) [1] 0 [1]
Charged to Other Accounts (5) (1) 4
Balance at End of Year 5 6 13
Deferred Tax Asset Valuation Allowance [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 2,222 2,336 2,386
Charged to Expense 24 (114) (50)
Deductions 0 [1] 0 [1] 0 [1]
Charged to Other Accounts 0 0 0
Balance at End of Year $ 2,246 $ 2,222 $ 2,336
[1] Represents write-offs of accounts considered to be uncollectible and previously reserved.