Intangible Assets (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense relating to all intangible assets	$ 13	$ 17
Amortization expense for remainder of the year	$ 47
Document Fiscal Year Focus	2020
Intangible assets amortization expense, year one	$ 53
Intangible assets amortization expense, year two	32
Intangible assets amortization expense, year three	24
Intangible assets amortization expense, year four	21
Intangible assets amortization expense, year five	$ 16