Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ (472)	$ (395)
Balance acquired from BHI	0	(142)
Additions for tax positions of the current year	(25)	(21)
Additions for tax positions of prior years	(27)	(95)
Reductions for tax positions of prior years	55	101
Settlements with tax authorities	6	35
Lapse of statute of limitations	12	45
Balance at end of year	$ (451)	$ (472)