Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions		12 Months Ended
	Jan. 01, 2020 USD ($)	Dec. 31, 2021 USD ($) Business_Segments	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) Business_Segments
Number of segments | Business_Segments		3		3
Charges associated with doubtful accounts		$ 31	$ 31	$ 30
Net aggregate financing receivables		247	254
Prepaid expenses		770	659
Income taxes receivable		812	700
Payments for purchases of investments		934	342	241
Investments in partnership		662	$ 172	$ 189
U.S. government assistance, amount awarded		568
Government assistance, amount recognized		73
Government assistance, amount recognized, operating expenses		41
Government assistance, amount recognized, capital expenditures		$ 32
Minimum
U.S. government assistance, transaction duration		1 year
Maximum
U.S. government assistance, transaction duration		4 years
Cumulative effect, period of adoption, adjustment | ASU 2016-13
Allowance for doubtful accounts, increase	$ 10