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Long-Term Debt - Narrative (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2020 | Sep. 02, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 01, 2020 | Jun. 22, 2020 | Aug. 26, 2019 | Aug. 28, 2018 | Dec. 19, 2016 | Sep. 23, 2016 | Dec. 07, 2015 | Nov. 21, 2012 | Sep. 30, 2009
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of senior notes |  |  | $ 600,000,000.0 | $ 0 | $ 1,300,000,000.0 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 0 | $ 0 | 15,900,000 |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | 67,100,000 |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | 6,200,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility | Unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 1,620,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 8,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due June 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 600,000,000.0 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
Senior notes | Senior Notes Due August 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 0.45% |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due September 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due September 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due February 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.35% |  |  |  |  |  |
Senior notes | Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.95% |  |  |  |  |  |
Senior notes | Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 3.65% |  |  |  |  |
Senior notes | Senior Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 800,000,000.0 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |
Senior notes | Senior Notes 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.80% |  |  |  |
Senior notes | Senior Notes 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 700,000,000.0 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.80% |  |  |  |
Senior notes | Senior Notes 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000.0 |  |
Interest rate | 3.00% |  |  |  |  |  |  |  |  |  |  | 3.00% |  |
Redemption of senior notes | $ 600,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.85% |  |
Senior notes | Senior Notes 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.125% |
Senior notes | Senior Notes 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25%
Redemption of senior notes |  |  |  |  | 500,000,000.0 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 15,900,000 |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt 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 |  |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | NYFRB Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | Eurodollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate floor |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | Current Variable Rate In Effect |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread based on current rating |  |  | 0.125% |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario Two | Eurodollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate floor |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Basis spread based on current rating |  |  | 1.125% |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Fee percentage on undrawn amounts |  | 0.125% |  |  |  |  |  |  |  |  |  |  |  |

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