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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