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Revenue Recognition, Accounts Receivable (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable |  |  |
Customer and agents |  | $ 867 | $ 861
Other |  | 88 | $ 100
Accounts receivable from contract with customer |  |  |
Accounts receivable |  |  |
Customer and agents |  | 863 |
Other |  | 66 |
Total | [1] | $ 929 |
[1] | These amounts do not include accounts receivable related to revenues outside the scope of ASU 2014-09; therefore, accounts receivable line items presented in this table will not agree to amounts presented in the Consolidated Balance Sheet.

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