Income taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
NOL and credit carryforwards	$ 1,065	$ 794
Accrued expenses	600	561
Expenses capitalized for tax	244	144
Stock-based compensation	96	92
Other	326	301
Total deferred income tax assets	2,331	1,892
Valuation allowance	(663)	(571)
Net deferred income tax assets	1,668	1,321
Deferred income tax liabilities:
Acquired intangible assets	(824)	(903)
Debt	(275)	(282)
Deferred Tax Liabilities, Property, Plant and Equipment	(129)	(148)
Other	(221)	(189)
Total deferred income tax liabilities	(1,449)	(1,522)
Total deferred income taxes, net	$ 219
Total deferred income taxes, net		$ (201)