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Quarterly Results of Operations (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations (Unaudited) | Quarterly Results of Operations (Unaudited) The following table summarizes quarterly unaudited results of operations for the periods presented.
| For The Quarter Ended
| March 31, 2019 |  | June 30, 2019 |  | Sept. 30, 2019 |  | December 31, 2019
| (In millions, except per-share data)
Total revenue | $ | 4,119 |  |  | $ | 4,193 |  |  | $ | 4,243 |  |  | $ | 4,274 |
Margin | 581 |  |  | 583 |  |  | 561 |  |  | 578 |
Net income | 198 |  |  | 196 |  |  | 175 |  |  | 168 |
Net income per share - Basic (1) | $ | 3.19 |  |  | $ | 3.15 |  |  | $ | 2.81 |  |  | $ | 2.70 |
Net income per share - Diluted (1) | $ | 2.99 |  |  | $ | 3.06 |  |  | $ | 2.75 |  |  | $ | 2.67 |
| For The Quarter Ended
| March 31, 2018 |  | June 30, 2018 |  | Sept. 30, 2018 |  | December 31, 2018
| (In millions, except per-share data)
Total revenue | $ | 4,646 |  |  | $ | 4,883 |  |  | $ | 4,697 |  |  | $ | 4,664 |
Margin | 615 |  |  | 673 |  |  | 566 |  |  | 664 |
Gain (loss) on sales of subsidiaries | — |  |  | — |  |  | 37 |  |  | (52 | )
Net income | 107 |  |  | 202 |  |  | 197 |  |  | 201 |
Net income per share - Basic (1) | $ | 1.79 |  |  | $ | 3.29 |  |  | $ | 3.22 |  |  | $ | 3.24 |
Net income per share - Diluted (1) | $ | 1.64 |  |  | $ | 3.02 |  |  | $ | 2.90 |  |  | $ | 3.01 |
________________________ (1) The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method and is based on the weighted-average common share equivalents outstanding during each quarter. Accordingly, the sum of the quarterly net income per share amounts may not agree to the total for the year.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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