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Investments in Unconsolidated Subsidiaries (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Unconsolidated subsidiaries [Member]
Dec. 31, 2013
Unconsolidated subsidiaries [Member]
Minimum [Member]
Dec. 31, 2013
Unconsolidated subsidiaries [Member]
Maximum [Member]
Dec. 31, 2013
Unconsolidated subsidiaries [Member]
Eastern Europe, Middle East & Africa [Member]
Sep. 30, 2013
AITA [Member]
Dec. 31, 2013
AITA [Member]
Dec. 31, 2013
STAEM [Member]
Dec. 31, 2013
Megapolis [Member]
Dec. 31, 2013
Other Unconsolidated Subsidiaries [Member]
Dec. 31, 2012
Other Unconsolidated Subsidiaries [Member]
Dec. 31, 2013
Other Unconsolidated Subsidiaries [Member]
Minimum [Member]
Dec. 31, 2012
Other Unconsolidated Subsidiaries [Member]
Minimum [Member]
Dec. 31, 2013
Other Unconsolidated Subsidiaries [Member]
Maximum [Member]
Dec. 31, 2012
Other Unconsolidated Subsidiaries [Member]
Maximum [Member]
Dec. 31, 2013
Equity Method Investment Goodwill
Schedule of Equity Method Investments [Line Items]                                  
Investments in unconsolidated subsidiaries $ 1,536 $ 24                 $ 42 $ 24         $ 519
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity     579                            
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Amortization Period       4 years 20 years                        
Equity Method Investment, Ownership Percentage               49.00% 25.00% 20.00%     40.00% 40.00% 50.00% 50.00%  
Payments to Acquire Equity Method Investments             625     750              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                   100              
Contingent Consideration Measurement Period                   4 years              
Investments In Unconsolidated Subsidiaries Notes Receivable                   100              
Equity Method Investments Discounted Liability                   86              
Business Combination, Contingent Consideration, Liability           86                      
Accounts Receivable, Related Parties, Current           470                      
Notes Receivable, Related Parties           100                      
Revenue from Related Parties           $ 345