Derivative Instruments and Hedging Activities - Part 1 (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Tables [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 607	$ 490
Interest Rate Contract [Member] | Libor and Euribor [Member]
Derivative Tables [Line Items]
Derivatives, notional amount	3,201
Foreign Exchange Contract [Member]
Derivative Tables [Line Items]
Derivative Liability, Fair Value, Gross Liability	60	$ 56
Unidad de Fomento (funds code) | Cross currency derivatives [Member]
Derivative Tables [Line Items]
Derivatives, notional amount	169
Unidad de Fomento (funds code) | Foreign Exchange Contract [Member]
Derivative Tables [Line Items]
Derivatives, notional amount	304
Argentina, Pesos | Foreign Exchange Contract [Member]
Derivative Tables [Line Items]
Derivatives, notional amount	162
Other unspecified currency [Domain] | Foreign Exchange Contract [Member]
Derivative Tables [Line Items]
Derivatives, notional amount	$ 687