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Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable |  |
Customer and agents | $ 989 | $ 992
Other | 127 | 107
Accounts receivable from contract with customer |  |
Accounts receivable |  |
Customer and agents | 984 | 987
Other | 107 | 73
Total | $ 1,091 | $ 1,060

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