Goodwill and Other Intangible Assets and Liablities (Tables)

12 Months Ended

Dec. 31, 2017

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 December 31, 2017				As of December 31, 2016
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Intangible assets	$	647	$	253	$	661	$	231
Intangible liabilities	$	1,403	$	932	$	1,403	$	836

Schedule of Finite-Lived Intangible Assets and Liabilities Amortization Expense

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

	December 31, 2017		December 31, 2016		December 31, 2015
Amortization of intangible assets	$	36	$	39	$	58
Amortization of intangible liabilities	$	96	$	100	$	115

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
2018	$	33	$	90
2019	$	31	$	27
2020	$	31	$	26
2021	$	31	$	24
2022	$	31	$	23