Other Intangible Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]

Schedule of Finite-Lived Intangible Assets and Liabilities

Intangible assets and liabilities were as follows (in millions):

	As of June 30, 2018				As of December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Intangible assets	$	653	$	271	$	647	$	253
Intangible liabilities	$	1,403	$	977	$	1,403	$	932

Schedule of Finite-Lived Intangible Assets and Liabilities Amortization Expense

Amortization of intangible assets and liabilities was as follows (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Amortization of intangible assets	$	9	$	9	$	18	$	18
Amortization of intangible liabilities	$	22	$	24	$	45	$	48

Schedule of Finite-Lived Intangible Assets and Liabilities, Future Amortization Expense

Amortization of intangible assets and liabilities for the next five years is expected to approximate the following (in millions):

	Amortization of intangible assets		Amortization of intangible liabilities
Remainder of 2018	$	17	$	45
2019	$	33	$	27
2020	$	33	$	26
2021	$	31	$	24
2022	$	31	$	23