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Notes Payable - General (Details) - Notes and bonds payable |  | 1 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2021 USD ($) | Jan. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Nov. 01, 2021 USD ($) | Jul. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 GBP (£) | Jul. 31, 2020 USD ($) | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 GBP (£)
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 12,257,000,000 |  |  |  |  |  | $ 8,303,000,000 |  |  |  |  |  |
Unamortized net premiums and deferred financing costs |  | 243,000,000 |  |  |  |  |  | (35,000,000) |  |  |  |  |  |
Net payable amount |  | 12,500,000,000 |  |  |  |  |  | $ 8,268,000,000 |  |  |  |  |  |
3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.25% |  |  |  | 3.25% |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 950,000,000 |  |  |  |  |  |
Total principal amount |  | $ 0 |  |  |  |  |  | 950,000,000 |  |  |  |  |  |
Early redemption of notes |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |
3.250% notes, issued in October 2012 and due in October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |
3.250% notes, issued in December 2017 and due in October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
4.650% notes, issued in July 2013 and due in August 2023 (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.65% |  |  | 4.65% |  |  | 4.65% |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |
Total principal amount |  | $ 0 |  |  |  |  |  | 750,000,000 |  |  |  |  |  |
Early redemption of notes |  | $ 750,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
4.600% notes, $500 issued February 2014, of which $485 was exchanged in November 2021, both due in February 2024 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.60% | 4.60% | 4.60% |  | 4.60% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 485,000,000 |  | $ 485,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 500,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
3.875% notes, issued in June 2014 and due in July 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.875% |  |  | 3.875% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 350,000,000 |  |  |  |  |  | 350,000,000 |  |  |  |  |  |
3.875% notes, issued in April 2018 and due in April 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.875% |  |  | 3.875% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 500,000,000 |  |  |  |  |  | 500,000,000 |  |  |  |  |  |
4.625% notes, $550 issued October 2018, of which $544 was exchanged in November 2021, both due in November 2025 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.625% | 4.625% | 4.625% |  | 4.625% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 544,000,000 |  | $ 544,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 550,000,000 |  |  |  |  |  | $ 0 |  |  |  |  |  |
0.750% notes, issued December 2020 and due in March 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 0.75% |  |  | 0.75% |  |  | 0.75% |  |  |  |  |  |
Principal amount |  | $ 325,000,000 |  |  |  |  |  | $ 325,000,000 |  |  |  |  |  |
Total principal amount |  | $ 325,000,000 |  |  |  |  |  | 325,000,000 |  |  |  |  |  |
4.875% notes, $600 issued June 2016, of which $596 was exchanged in November 2021, both due in June 2026 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.875% | 4.875% | 4.875% |  | 4.875% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 596,000,000 |  | $ 596,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 600,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
4.125% notes, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.125% |  |  | 4.125% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 650,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | 650,000,000 |  |  |  |  |  | 650,000,000 |  |  |  |  |  |
4.125% notes, issued in September 2014 and due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
4.125% notes, issued in March 2017 and due in October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
3.000% notes, issued in October 2016 and due in January 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.00% |  |  | 3.00% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 600,000,000 |  |  |  |  |  | 600,000,000 |  |  |  |  |  |
1.125% notes, issued in July 2021 and due in July 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.125% |  |  | 1.125% |  | 1.125% |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  | £ 400,000,000 |  | £ 400,000,000 |  |  |  |  |  |  |
Total principal amount |  | $ 541,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
3.950% notes, $600 issued August 2017, of which $594 was exchanged in November 2021, both due in August 2027 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.95% | 3.95% | 3.95% |  | 3.95% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 594,000,000 |  | $ 594,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 600,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
3.650% notes, issued in December 2017 and due in January 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.65% |  |  | 3.65% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 550,000,000 |  |  |  |  |  | 550,000,000 |  |  |  |  |  |
3.400% notes, $600 issued June 2020, of which $598 was exchanged in November 2021, both due in January 2028 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.40% | 3.40% | 3.40% |  | 3.40% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 598,000,000 |  | $ 598,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 600,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
2.200% notes, $500 issued November 2020, of which $497 was exchanged in November 2021, both due in June 2028 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 2.20% | 2.20% | 2.20% |  | 2.20% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 497,000,000 |  | $ 497,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 500,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
3.250% notes, issued in June 2019 and due in June 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.25% |  |  | 3.25% |  |  |  |  |  |  |  | 3.25% |
Principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Total principal amount |  | $ 500,000,000 |  |  |  |  |  | 500,000,000 |  |  |  |  |  |
3.100% notes, $600 issued December 2019, of which $596 was exchanged in November 2021, both due in December 2029 (3) (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.10% | 3.10% | 3.10% |  | 3.10% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 599,000,000 |  |  |  | $ 599,000,000 |  |  |  |  |  | $ 600,000,000 |  |
Amount exchanged | $ 596,000,000 |  | $ 596,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 599,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
Early participation premium per $1000 of principal |  |  |  |  |  | $ 30 |  |  |  |  |  |  |  |
1.625% notes, issued in October 2020 and due December 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.625% |  |  | 1.625% |  |  |  | 1.625% |  |  |  |  |
Principal amount | £ |  |  |  |  | £ 400,000,000 |  |  |  | £ 400,000,000 |  |  |  |  |
Total principal amount |  | $ 541,000,000 |  |  |  |  |  | 547,000,000 |  |  |  |  |  |
3.250% notes, $600 issued in May 2020 and $350 issued in July 2020, both due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.25% |  |  | 3.25% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | 950,000,000 |  |  |  |  |  | 950,000,000 |  |  |  |  |  |
3.250% notes, issued in May 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |
Principal amount |  | 600,000,000 |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |
3.250% notes, issued in July 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |
Principal amount |  | $ 350,000,000 |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
2.850% notes, $700 issued November 2020, of which $699 was exchanged in November 2021, both due in December 2032 (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 2.85% | 2.85% | 2.85% |  | 2.85% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount exchanged | $ 699,000,000 |  | $ 699,000,000 |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | $ 700,000,000 |  |  |  |  |  | $ 0 |  |  |  |  |  |
1.800% notes, issued in December 2020 and due in March 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.80% |  |  | 1.80% |  |  | 1.80% |  |  |  |  |  |
Principal amount |  | $ 400,000,000 |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |
Total principal amount |  | $ 400,000,000 |  |  |  |  |  | 400,000,000 |  |  |  |  |  |
1.750% notes, issued in July 2021 and due in July 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.75% |  |  | 1.75% |  | 1.75% |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  | £ 350,000,000 |  | £ 350,000,000 |  |  |  |  |  |  |
Total principal amount |  | $ 474,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |
2.730% notes, issued in May 2019 and due in May 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.73% |  |  | 2.73% |  |  |  |  |  |  |  |  | 2.73%
Principal amount | £ |  |  |  |  | £ 315,000,000 |  |  |  |  |  |  |  |  | £ 315,000,000
Total principal amount |  | $ 427,000,000 |  |  |  |  |  | 431,000,000 |  |  |  |  |  |
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.875% |  |  | 5.875% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | 250,000,000 |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
5.875% bonds, issued in March 2005 and due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
5.875% bonds, issued in June 2011 and due in March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.65% |  |  | 4.65% |  |  |  |  |  |  |  |  |
Principal amount |  | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount |  | 550,000,000 |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |
4.650% notes, issued in March 2017 and due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
4.650% notes, issued in December 2017 and due in March 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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