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Long-Term Debt and Revolving Credit Arrangements - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Disclosure [Abstract]        
Contractual interest coupon $ 118 $ 118 $ 338 $ 333
Amortization of debt discount and issuance costs 3 3 13 8
Total interest expense from long-term debt $ 121 $ 121 $ 351 $ 341