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Accounting Policies - Related Party Transactions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) state | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) state | Jun. 30, 2017 USD ($)
Related Party Transaction |  |  |  |
Expenses from transactions with related party | $ 8 | $ 8 | $ 30 | $ 25
Equity Method Investee |  |  |  |
Related Party Transaction |  |  |  |
Other revenues from transactions with related party | $ 36 | $ 30 | $ 71 | $ 70
Heartland Healthcare Services |  |  |  |
Related Party Transaction |  |  |  |
Number of states in which entity operates | state | 4 |  | 4 |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Details
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