Intangible Assets (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Document Period End Date			Jun. 30, 2016
Amortization expense relating to all intangible assets	$ 16	$ 16	$ 33	$ 27
Amortization expense for remainder of the year	31		$ 31
Document Fiscal Year Focus			2016
Intangible assets amortization expense, year one	55		$ 55
Intangible assets amortization expense, year two	42		42
Intangible assets amortization expense, year three	39		39
Intangible assets amortization expense, year four	38		38
Intangible assets amortization expense, year five	$ 23		$ 23