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Debt and Credit Facilities - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2016 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) repayment | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 4,750,000,000 |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | 0 |  |  |
Long-term debt |  | $ 26,695,000,000 |  |  |  |  | $ 26,695,000,000 |  |  | 26,695,000,000 | $ 31,402,000,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 | $ 1,000,000,000 |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  |  |  |  |  |  |  |  | $ 3,750,000,000 |  |  |
Redemption price, percentage of principal amount repurchased |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  | 101.00% |  |  |
Long-term debt |  | $ 25,750,000,000 |  |  |  |  | 25,750,000,000 |  |  | $ 25,750,000,000 |  |  |
Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Number of early repayments | repayment |  |  |  |  |  |  | 2 |  |  |  |  |  |
4.50% Senior Unsecured Notes Due in April 2021 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |
Interest rate, stated percentage |  | 4.50% |  |  |  |  | 4.50% |  |  | 4.50% |  |  |
Long-term debt |  | $ 0 |  |  |  |  | $ 0 |  |  | $ 0 | 1,000,000,000 |  |
4.40% Senior Unsecured Notes Due In December 2021 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 4.40% |  |  |  |  | 4.40% |  |  | 4.40% |  |  |
Long-term debt |  | $ 0 |  |  |  |  | $ 0 |  |  | $ 0 | 1,249,000,000 |  |
0.15% LIBOR Senior Unsecured Notes Due September 2021 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  |  |  |  | $ 0 |  |  | $ 0 | 499,000,000 |  |
0.75% Senior Unsecured Notes Due in September 2023 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 0.75% |  |  |  |  | 0.75% |  |  | 0.75% |  |  |
Long-term debt |  | $ 1,496,000,000 |  |  |  |  | $ 1,496,000,000 |  |  | $ 1,496,000,000 | 1,992,000,000 |  |
0.52% LIBOR Senior Unsecured Notes Due September 2023 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  | 0 |  |  |  |  | $ 0 |  |  | $ 0 | 498,000,000 |  |
1.95% Senior Unsecured Notes Due in March 2022 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 1.95% |  |  |  |  | 1.95% |  |  | 1.95% |  |  |
Long-term debt |  | $ 500,000,000 |  |  |  |  | $ 500,000,000 |  |  | $ 500,000,000 | 499,000,000 |  |
the "2020 Fixed Rate Notes" | Senior notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Call feature, period prior to maturity |  |  |  |  |  |  |  |  |  | 1 month |  |  |
the "2020 Fixed Rate Notes" | Senior notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Call feature, period prior to maturity |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Three year senior unsecured term loan facility | Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Debt instrument, term |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
2016 revolving credit facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2020 revolving credit facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |
Amounts outstanding under the facility |  | 0 |  |  |  |  | 0 |  |  | 0 | 0 |  |
Variable Term Loan Note Due October 2023 | Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  |  |  |  | $ 0 |  |  | $ 0 | $ 998,000,000 |  |

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