Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions		12 Months Ended
Jan. 01, 2020 USD ($)	Dec. 31, 2020 USD ($) Business	Dec. 31, 2019 USD ($) Business	Dec. 31, 2018 USD ($)
Number of segments \| Business		3	3
Charges associated with doubtful accounts		$ 31	$ 30	$ 31
Net aggregate financing receivables		254	244
Payments for purchases of investments		342	241	$ 146
Payments to purchase investments, investments in partnership		172	189
Gains on investments		18
Decrease in retained Earnings		$ 27,159	$ 24,166
Cumulative effect, period of adoption, adjustment \| ASU 2016-13
Allowance for doubtful accounts, increase	$ 10
Decrease in retained Earnings	$ (8)

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Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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