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Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Table Text Block] | A summary of property, equipment and capitalized software is as follows:
(in millions) |  | December 31, 2020 |  | December 31, 2019
Land and improvements |  | $ | 533 |  |  | $ | 589 |
Buildings and improvements |  | 4,759 |  |  | 4,705 |
Computer equipment |  | 1,767 |  |  | 2,015 |
Furniture and fixtures |  | 1,787 |  |  | 1,752 |
Less accumulated depreciation |  | (3,364) |  |  | (3,328) |
Property and equipment, net |  | 5,482 |  |  | 5,733 |
Capitalized software |  | 5,010 |  |  | 4,638 |
Less accumulated amortization |  | (1,866) |  |  | (1,667) |
Capitalized software, net |  | 3,144 |  |  | 2,971 |
Total property, equipment and capitalized software, net |  | $ | 8,626 |  |  | $ | 8,704 |
Redeemable Noncontrolling Interest [Table Text Block] | The following table provides details of the Company's redeemable noncontrolling interests’ activity for the years ended December 31, 2020 and 2019:
(in millions) |  | 2020 |  | 2019
Redeemable noncontrolling interests, beginning of period |  | $ | 1,726 |  |  | $ | 1,908 |
Net earnings |  | 112 |  |  | 115 |
Acquisitions |  | 321 |  |  | 90 |
Redemptions |  | — |  |  | (618) |
Distributions |  | (149) |  |  | (69) |
Fair value and other adjustments |  | 201 |  |  | 300 |
Redeemable noncontrolling interests, end of period |  | $ | 2,211 |  |  | $ | 1,726 |
Useful Life [Member] |
Property, Plant and Equipment [Table Text Block] | The Company calculates depreciation and amortization using the straight-line method over the estimated useful lives of the assets. The useful lives for property, equipment and capitalized software are:
Furniture, fixtures and equipment | 3 to 10 years
Buildings | 35 to 40 years
Capitalized software | 3 to 5 years

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References No definition available. + Details
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