Borrowing Arrangements - Fair Value of Market Price (Details) - Senior Notes - USD ($) $ in Millions	Apr. 30, 2022	Oct. 31, 2021	Jan. 31, 2020	Jun. 30, 2015	Dec. 31, 2012
2012 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 350				$ 350
Fair value	350
2015 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	300			$ 300
Fair value	305
2017 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	500
Fair value	486
2020 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	500		$ 500
Fair value	443
2021 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	1,000	$ 1,000
Fair value	$ 836