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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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