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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 |  |  |

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