Amounts in Paragraphs - Income Taxes (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate	21.60%	14.50%	11.80%
IT services divestiture nondeductible goodwill	$ 250	$ 0	$ 0
IT services divestiture nondeductible goodwill	1,200
Significant matters affecting comparability		(1.30%)	(3.70%)
Income taxes paid, net	1,300	$ 312	$ 324
Tax Credit Carryforward, Amount	524
Operating Loss Carryforwards	316
Tax Credit Carryforward, Valuation Allowance	230
Operating Loss Carryforwards, Valuation Allowance	40
Income Taxes Receivable	571	792
Unrecognized Tax Benefits Related to Methods of Accounting - 451(b)	399
Current unrecognized tax benefits	$ 590	$ 433