Intangible Assets (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense relating to all intangible assets	$ 16	$ 14	$ 29	$ 31
Amortization expense for remainder of the year	35		$ 35
Document Fiscal Year Focus			2020
Intangible assets amortization expense, year one	63		$ 63
Intangible assets amortization expense, year two	32		32
Intangible assets amortization expense, year three	24		24
Intangible assets amortization expense, year four	21		21
Intangible assets amortization expense, year five	$ 16		$ 16