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Notes Payable - General (Details) - Notes and bonds payable | 1 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 GBP (£) | Jul. 31, 2020 USD ($) | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 GBP (£) | Apr. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2014 USD ($) | Oct. 31, 2012 USD ($) | Jun. 30, 2011 USD ($) | Mar. 31, 2005 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 8,303,000,000 |  |  |  |  | $ 6,318,000,000 |  |  |  |  |  |  |  |  |
Unamortized net original issuance premiums and deferred financing costs |  |  | (35,000,000) |  |  |  |  | (30,000,000) |  |  |  |  |  |  |  |  |
Net payable amount |  |  | 8,268,000,000 |  |  |  |  | 6,288,000,000 |  |  |  |  |  |  |  |  |
5.750% notes, issued in June 2010 and due in January 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | 0 |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.75% |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |
Early repayment of notes payable |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 950,000,000 |  |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.25% | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of notes payable | $ 950,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, issued in October 2012 and due in October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |
3.250% notes, issued in December 2017 and due in October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
4.650% notes, issued in July 2013 and due in August 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 750,000,000 |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.65% | 4.65% |  |  |  |  |  |  |  |  |  |  |  |  |
3.875% notes, issued in June 2014 and due in July 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 350,000,000 |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.875% | 3.875% |  |  |  |  |  |  |  |  |  |  |  |  |
3.875% notes, issued in April 2018 and due in April 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 500,000,000 |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.875% | 3.875% |  |  |  |  |  |  | 3.875% |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
0.750% notes, issued in December 2020 and due in March 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 325,000,000 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 0.75% | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  | $ 325,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.125% notes, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 650,000,000 |  |  |  |  | 650,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.125% | 4.125% |  |  |  |  |  |  |  |  |  |  |  |  |
4.125% notes, issued in September 2014 and due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |
4.125% notes, issued in March 2017 and due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
3.000% notes, issued in October 2016 and due in January 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 600,000,000 |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
3.650% notes, issued in December 2017 and due in January 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 550,000,000 |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.65% | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, issued in June 2019 and due in June 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 500,000,000 |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.25% | 3.25% |  |  |  |  | 3.25% |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
1.625% notes, issued in October 2020 and due December 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 547,000,000 | £ 400,000,000.0 |  |  |  | 0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.625% | 1.625% | 1.625% |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes | £ |  |  |  |  | £ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, $600 issued in May 2020 and $350 issued in July 2020, both due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 950,000,000 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.25% | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
3.250% notes, issued in May 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |
3.250% notes, issued in July 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |
1.800% notes, issued in December 2020 and due in March 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 400,000,000 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.80% | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.730% notes, issued in May 2019 and due in May 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 431,000,000 | £ 315,000,000.0 |  |  |  | 418,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.73% | 2.73% |  |  |  |  |  | 2.73% |  |  |  |  |  |  |
Face amount of notes | £ |  |  |  |  |  |  |  |  |  | £ 315,000,000 |  |  |  |  |  |  |
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 250,000,000 |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.875% | 5.875% |  |  |  |  |  |  |  |  |  |  |  |  |
5.875% bonds, issued in March 2005 and due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
5.875% bonds, issued in June 2011 and due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |
4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  |  | $ 550,000,000 |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.65% | 4.65% |  |  |  |  |  |  |  |  |  |  |  |  |
4.650% notes, issued in March 2017 and due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
4.650% notes, issued in December 2017 and due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |

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