Fair Value of Financial Instruments, Derivative Contracts (Details) - Jun. 30, 2015 - Foreign Exchange Forward Contracts [Member] € in Millions, £ in Millions, NOK in Millions, MYR in Millions, AUD in Millions, $ in Millions	USD ($)	NOK	MYR	AUD	EUR (€)	GBP (£)
Buy [Member]
Derivative [Line Items]
Notional Amount	$ 43	NOK 1,022	MYR 336	AUD 0	€ 239	£ 149
Buy [Member] | 2015 [Member]
Derivative [Line Items]
Notional Amount	11	412	275	0	143	140
Buy [Member] | 2016 [Member]
Derivative [Line Items]
Notional Amount	30	579	61	0	60	9
Buy [Member] | 2017 [Member]
Derivative [Line Items]
Notional Amount	2	31	0	0	36	0
Sell [Member]
Derivative [Line Items]
Notional Amount	(773)	(99)	(16)	(1)	(60)	(26)
Sell [Member] | 2015 [Member]
Derivative [Line Items]
Notional Amount	(411)	(31)	(16)	(1)	(49)	(25)
Sell [Member] | 2016 [Member]
Derivative [Line Items]
Notional Amount	(260)	(64)	0	0	(11)	(1)
Sell [Member] | 2017 [Member]
Derivative [Line Items]
Notional Amount	(101)	(4)	0	0	0	0
Sell [Member] | 2018 [Member]
Derivative [Line Items]
Notional Amount	$ (1)	NOK 0	MYR 0	AUD 0	€ 0	£ 0