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Borrowings - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Aug. 17, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Nov. 01, 2015 | Dec. 31, 2011 | Sep. 30, 2011 | May 31, 2011
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 17,000,000 | $ 19,000,000 |  |  |  |  |  |  |  |
Discounts on debt issuance |  | 3,000,000 |  |  |  |  |  |  |  |  |
Fair value adjustment related to hedged debt |  | 28,000,000 | (8,000,000) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 126,000,000 | $ 0 | $ 0 |  |  |  |  |  |  |
U.S. Dollar Global Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of outstanding debt extinguished | $ 1,850,000,000 |  |  |  |  |  |  |  |  |  |
4.65% notes due December 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 4.65% |  |  |  |  |  |  | 4.65% |  |
4.375% notes due September 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 4.375% |  |  |  |  |  |  |  | 4.375% |
4.300% notes due June 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 4.30% |  |  |  |  |  |  |  |  | 4.30%
Commercial paper |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 6,000,000,000.0 |  |  |  |  | $ 6,000,000,000.0 | $ 4,000,000,000.0 |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,500,000,000.0 |  |  |  |  |
Terminated revolving credit agreement |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |
Credit Facility | Senior unsecured committed revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 4,000,000,000.0 |  |  |  |  |  |  |  |  |
Credit Facility | Lines of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Uncommitted lines of credit |  | $ 667,000,000 |  |  |  |  |  |  |  |  |

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