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Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 15, 2021 | Nov. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Oct. 31, 2022 | Oct. 30, 2022 | May 31, 2022 | Apr. 09, 2021 | Apr. 08, 2021 | Apr. 02, 2021 | Apr. 01, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | $ 17,000,000 | $ 268,000,000 |  |  |  |  |  |  |
Commercial paper outstanding |  |  | 0 | 0 |  |  |  |  |  |  |
Repayments of principal in 2023 |  |  |  | 268,000,000 |  |  |  |  |  |  |
Repayments of principal in 2024 |  |  |  | 1,600,000,000 |  |  |  |  |  |  |
Repayments of principal in 2025 |  |  |  | 518,000,000 |  |  |  |  |  |  |
Repayments of principal in 2026 |  |  |  | 1,200,000,000 |  |  |  |  |  |  |
Repayments of principal in 2027 |  |  |  | 21,000,000 |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Amended Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  | $ 2,800,000,000 | $ 1,800,000,000
Revolving credit facility, amount outstanding |  |  | 0 | 0 |  |  |  |  |  |  |
Uncommitted Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, borrowing capacity |  |  |  |  |  |  | $ 250,000,000 |  |  |  |
Revolving credit facility, amount outstanding |  |  |  | 0 |  |  |  |  |  |  |
Other Debt Facilities |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount outstanding |  |  | 0 | 0 |  |  |  |  |  |  |
Debt instrument, unused borrowing capacity |  |  | $ 508,000,000 | $ 514,000,000 |  |  |  |  |  |  |
Senior notes – 5.750% due 2032 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.75% |  |  |  |  |  |
Senior notes – 5.750% due 2032 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Senior notes – 6.250% due 2052 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.25% |  |  |  |  |  |
Senior notes – 6.250% due 2052 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
3.30% Senior Debt Obligations Due January 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.30% |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
Senior notes – 2.375% due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.375% | 2.375% |  |  |  |  |  |  |
Senior notes – 2.375% due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Senior notes – 2.90% due 2051 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.90% | 2.90% |  |  |  |  |  |  |
Senior notes – 2.90% due 2051 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount |  |  | $ 350,000,000 |  |  |  |  |  |  |  |
2.75% Senior Debt Obligations Due January 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.75% |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 2,800,000,000 | $ 2,000,000,000 |  | $ 2,000,000,000 | $ 1,500,000,000 |  |
Line of Credit | New Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, borrowing capacity |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |  |  |  |  |

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