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v3.20.2

Debt (Details) - USD ($) | Oct. 09, 2020 | Sep. 30, 2020 | Sep. 02, 2020 | Sep. 01, 2020 | Jun. 22, 2020 | Sep. 23, 2016
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Revolving credit facility | JPMorgan Chase Bank, N.A. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term |  |  | 3 years |  |  |
Maximum borrowing capacity |  |  | $ 3,000,000,000.0 |  |  | $ 2,500,000,000.0
Potential increase limit |  |  | $ 500,000,000.0 |  |  |
Fee percentage on outstanding letters of credit |  |  | 1.125% |  |  |
Fee percentage on undrawn amounts |  |  | 0.125% |  |  |
Total Debt to Total Capital Ratio, minimum required |  |  | 0.65 |  |  |
Revolving credit facility | JPMorgan Chase Bank, N.A. | NYFRB Rate | Interest rate scenario one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 0.50% |  |  |
Revolving credit facility | JPMorgan Chase Bank, N.A. | Eurocurrency Rate | Interest rate scenario one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 1.00% |  |  |
Interest rate floor |  |  | 0.00% |  |  |
Revolving credit facility | JPMorgan Chase Bank, N.A. | Eurocurrency Rate | Interest rate scenario two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate floor |  |  | 0.00% |  |  |
Basis spread based on current rating |  | 1.125% |  |  |  |
Revolving credit facility | JPMorgan Chase Bank, N.A. | Current variable rate in effect | Interest rate scenario one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread based on current rating |  | 0.125% |  |  |  |
Letters of credit | JPMorgan Chase Bank, N.A. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 150,000,000.0 |  |  |
Fee percentage on undrawn amounts |  |  | 0.125% |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |
Senior Notes | 2022 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 300,000,000.0 |  |
Fixed interest rate |  |  |  | 0.45% |  |
Senior Notes | 2025 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 700,000,000.0 |  |
Fixed interest rate |  |  |  | 1.00% |  |
Senior Notes | 2027 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 700,000,000.0 |  |
Fixed interest rate |  |  |  | 1.40% |  |
Senior Notes | 2031 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 1,000,000,000.0 |  |
Fixed interest rate |  |  |  | 1.75% |  |
Senior Notes | 2030 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 600,000,000.0 |
Fixed interest rate |  |  |  |  | 2.00% |
Senior Notes | 2020 Notes | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed interest rate | 3.00% |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |
Principal amount of debt redeemed | $ 600,000,000.0 |  |  |  |  |

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