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Debt and Borrowing Arrangements - Interest and Other Expense, Net (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]              
Interest expense, debt         $ 423 $ 484 $ 462
Loss on debt extinguishment and related expenses $ 185 $ 0 $ 0 $ 0 185 0 140
Loss/(gain) related to interest rate swaps         103 111 (10)
Other (income)/expense, net         (103) (139) (72)
Interest and other expense, net         $ 608 $ 456 $ 520