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Revenue - Contract Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Contract Assets (Unearned Income) |  |  |  |  |
Current contract assets | $ 159 |  | $ 159 |  | $ 151
Long-term contract assets | 9 |  | 9 |  | 13
Current unearned income | (124) |  | (124) |  | (133)
Long-term unearned income | (40) |  | (40) |  | (29)
Net Contract Assets (Unearned Income) | 4 |  | 4 |  | 2
Accounts receivable, net | 664 |  | 664 |  | $ 670
Revenue recognized | $ 30 | $ 22 | $ 88 | $ 64 |

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