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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |
Operating Lease, Cost |  | $ 1,200 | $ 1,100 | $ 1,000
Operating Lease, Payments |  | $ 921 | $ 865 | $ 746
Operating Lease, Weighted Average Remaining Lease Term |  | 8 years 8 months 12 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 2.90% |  |
Undrawn Letters Of Credit |  | $ 181 |  |
Surety Bonds Outstanding |  | $ 1,300 |  |
Other Commitments, Description |  | In 2021, we entered into agreements to acquire multiple companies in the health care sector, most notably, Change Healthcare (NASDAQ: CHNG), subject to regulatory approval and other customary closing conditions. |  |
Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | $ 12,000 |  |  |
Subsequent Event, Description | Additionally, in January 2022, we entered into agreements to acquire multiple companies in the health care sector, subject to regulatory approval and other customary closing conditions. |  |  |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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