Recent Accounting Pronouncements (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit)		$ 0	$ 2
Net Income (Loss) Attributable to Parent		$ (333)	(21)
Previously Reported [Member]
Income Tax Expense (Benefit)			(2)
Net Income (Loss) Attributable to Parent			$ (17)
Earnings Per Share, Basic and Diluted			$ (0.20)
ASU 2016-13 [Member]
Cumulative-effect adjustment, net of tax	$ 42
ASU 2019-12 [Member]
Income Tax Expense (Benefit)			$ 2
Net Income (Loss) Attributable to Parent			$ (21)
Earnings Per Share, Basic and Diluted			$ (0.24)