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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |
Operating Lease, Cost |  |  |  | $ 1,100 | $ 1,000 | $ 751
Operating Lease, Payments |  |  |  | $ 865 | $ 746 |
Operating Lease, Weighted Average Remaining Lease Term |  | 8 years 8 months 12 days |  | 8 years 8 months 12 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.00% |  | 3.00% |  |
Undrawn Letters Of Credit |  | $ 134 |  | $ 134 |  |
Surety Bonds Outstanding |  | $ 1,200 |  | $ 1,200 |  |
Other Commitments, Description |  | In the fourth quarter of 2020, the Company entered into agreements to acquire multiple companies in the health care sector, which are expected to close in the first half of 2021, subject to regulatory approval and other customary closing conditions. |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Subsequent Event, Description | Additionally, in January 2021, the Company entered into agreements to purchase multiple companies in the health care sector, most notably, Change Healthcare (NASDAQ: CHNG). This acquisition is expected to close in the second half of 2021, subject to Change Healthcare shareholders’ approval, regulatory approvals and other customary closing conditions. |  |  |  |  |
Payments to be made to Acquire Businesses Net |  |  | $ 13,000 |  |  |

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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=121568110&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=121609121&loc=SL77918686-209980 + Details
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