Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Derivative Asset [Abstract]
Derivatives accounted for as cash flow hedges associated with debt:	[1]	$ 0	$ 0
Total Derivative Financial Assets	[1]	18	15
Less: Gross amounts offset in the balance sheet	[1],[2]	(18)	(15)
Net amounts of derivative financial assets and liabilities presented in the balance sheet	[1],[3]	0	0
Derivative Liability [Abstract]
Derivatives accounted for as cash flow hedges associated with debt:	[1]	(47)	(58)
Total Derivative Financial Liabilities	[1]	(63)	(344)
Less: Gross amounts offset in the balance sheet	[1],[2]	63	332
Net amounts of derivative financial assets and liabilities presented in the balance sheet	[1],[3]	0	(12)
Debt [Member]
Derivative Asset [Abstract]
Non-qualifying hedge activities:	[1]	18	15
Derivative Liability [Abstract]
Non-qualifying hedge activities:	[1]	(16)	(286)
Currency swaps [Member]
Derivative Asset [Abstract]
Derivatives accounted for as cash flow hedges associated with debt:	[1]	0	0
Derivative Liability [Abstract]
Derivatives accounted for as cash flow hedges associated with debt:	[1]	(47)	(58)
Cross currency interest rate swaps [Member] | Debt [Member]
Derivative Asset [Abstract]
Non-qualifying hedge activities:	[1]	18	15
Derivative Liability [Abstract]
Non-qualifying hedge activities:	[1]	$ (16)	$ (286)

[1] All of our derivatives are bilateral over-the-counter derivatives.

[2] Represents the netting of derivative receivable and payable balances for the same counterparty under an enforceable netting agreement. Gross amounts offset in the balance sheet includes cash collateral paid of $50 million at June 30, 2017 and $317 million at December 31, 2016. At June 30, 2017 and December 31, 2016, we did not have any financial instrument collateral received/posted.

[3] At June 30, 2017 and December 31, 2016, we had not received any cash not subject to an enforceable master netting agreement.