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v3.20.2

Borrowings - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2020 USD ($) | May 29, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jul. 31, 2020 USD ($) commercial_paper_program | Jul. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) commercial_paper_program | Jul. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Oct. 31, 2019 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Issuance costs |  |  | $ 26,000,000 | $ 38,000,000 |  | $ 38,000,000 |  |  | $ 16,000,000
Notional amount |  |  |  | 20,861,000,000 |  | 20,861,000,000 |  |  | $ 23,669,000,000
Loss on extinguishment of debt |  |  |  | $ 40,000,000 | $ 0 | $ 40,000,000 | $ 0 |  |
Number of commercial paper programs | commercial_paper_program |  |  |  | 2 |  | 2 |  |  |
Treasury Lock | Cash flow hedges |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 750,000,000 |  | $ 750,000,000 |  | $ 750,000,000 |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  | 500,000,000 | 500,000,000 |  | 500,000,000 |  |  |
Shelf Registration 2019 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | 3,000,000,000.0 |  |  |  |  |  |
$1,150 issued at discount to par at a price of 99.769% in June 2020 at 2.2%, due June 2025 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,150,000,000 | $ 1,150,000,000 |  | $ 1,150,000,000 |  |  |
Interest rate (percent) |  |  | 2.20% | 2.20% |  | 2.20% |  |  |
$1,000 issued at discount to par at a price of 99.718% in June 2020 at 3.0%, due June 2027 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,000,000,000.0 | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |
Interest rate (percent) |  |  | 3.00% | 3.00% |  | 3.00% |  |  |
$850 issued at discount to par at a price of 99.790% in June 2020 at 3.4%, due June 2030 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 850,000,000 | $ 850,000,000 |  | $ 850,000,000 |  |  |
Interest rate (percent) |  |  | 3.40% | 3.40% |  | 3.40% |  |  |
$1,350 issued at discount to par at a price of 99.827% in December 2010 at 3.75%, due December 2020 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  | $ 1,350,000,000 |  | $ 1,350,000,000 |  |  |
Interest rate (percent) | 3.75% |  | 3.75% | 3.75% |  | 3.75% |  |  |
Repurchased amount | $ 500,000,000 |  |  |  |  |  |  |  |
$1,250 issued at discount to par at a price of 99.799% in May 2011 at 4.3%, due June 2021 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  | $ 1,250,000,000 |  | $ 1,250,000,000 |  |  |
Interest rate (percent) | 4.30% |  | 4.30% | 4.30% |  | 4.30% |  |  |
Repurchased amount | $ 400,000,000 |  |  |  |  |  |  |  |
$1,000 issued at discount to par at a price of 99.816% in September 2011 at 4.375%, due September 2021 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |
Interest rate (percent) |  |  | 4.375% | 4.375% |  | 4.375% |  |  |
$1,500 issued at discount to par at a price of 99.707% in December 2011 at 4.65%, due December 2021 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |
Interest rate (percent) |  |  | 4.65% | 4.65% |  | 4.65% |  |  |
Shelf Registration 2009, Due December 2020, June 2021, September 2021, And December 2021 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Repurchased amount |  |  | $ 700,000,000 |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 23,000,000 |  |  |  |  |  |
Shelf Registration Due December 2020 and September 2021 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Repurchased amount |  |  | $ 900,000,000 |  |  |  |  |  |
Loss on extinguishment of debt | $ 17,000,000 |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under credit facility |  |  |  | $ 6,000,000,000.0 |  | $ 6,000,000,000.0 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under credit facility |  |  |  | 4,000,000,000.0 |  | 4,000,000,000.0 |  |  |
Senior unsecured revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under credit facility |  | $ 1,000,000,000.0 |  |  |  |  |  |  |
Revolving credit facility, term |  | 364 days |  |  |  |  |  |  |
Credit facilities |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing resources |  |  |  | $ 725,000,000 |  | $ 725,000,000 |  |  |

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