Derivative Contracts (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Buy Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	$ 214
Buy Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	428
Buy Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	1,016
Buy Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	115
Buy U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	60
Buy U.S. dollar [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	87
Sell Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(11)
Sell Euro [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	0
Sell Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(29)
Sell Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(140)
Sell Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(23)
Sell U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(682)
2015 [Member] | Buy Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	200
2015 [Member] | Buy Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	377
2015 [Member] | Buy Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	895
2015 [Member] | Buy Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	110
2015 [Member] | Buy U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	60
2015 [Member] | Buy U.S. dollar [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	87
2015 [Member] | Sell Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(10)
2015 [Member] | Sell Euro [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	0
2015 [Member] | Sell Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(29)
2015 [Member] | Sell Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(96)
2015 [Member] | Sell Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(22)
2015 [Member] | Sell U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(635)
2016 [Member] | Buy Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	14
2016 [Member] | Buy Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	51
2016 [Member] | Buy Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	117
2016 [Member] | Buy Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	5
2016 [Member] | Buy U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2016 [Member] | Buy U.S. dollar [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	0
2016 [Member] | Sell Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(1)
2016 [Member] | Sell Euro [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	0
2016 [Member] | Sell Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2016 [Member] | Sell Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(44)
2016 [Member] | Sell Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(1)
2016 [Member] | Sell U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	(47)
2017 [Member] | Buy Euro [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2017 [Member] | Buy Malaysian ringgit [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2017 [Member] | Buy Norwegian krone [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	4
2017 [Member] | Buy Pound Sterling [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2017 [Member] | Buy U.S. dollar [Member] | Foreign exchange forward contracts [Member]
Derivative [Line Items]
Notional Amount	0
2017 [Member] | Buy U.S. dollar [Member] | Foreign exchange option contracts [Member]
Derivative [Line Items]
Notional Amount	$ 0