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Debt and Lines of Credit - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) | May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Aug. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) seriesOfDebt
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  | $ 0 |  |  |
Repayments of debt |  |  |  |  |  |  |  | 550,000,000 | $ 500,000,000 | $ 750,000,000 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  | 1,495,000,000 | 1,498,000,000 | 1,491,000,000 |
Interest and debt expense |  |  |  |  |  |  |  | 184,000,000 | 190,000,000 | 170,000,000 |
Interest paid |  |  |  |  |  |  |  | $ 181,000,000 | $ 182,000,000 | $ 156,000,000 |
Notes due 2021 at 2.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 550,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 2.75% |  |  |
Notes due 2026 at 1.125% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 1.125% |  |  | 1.125%
Notes due 2031 at 1.90% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 1.90% |  |  | 1.90%
Notes due 2051 at 2.70% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 2.70% |  |  | 2.70%
Notes due 2025 at 1.375% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 1.375% |  |  |
Payments of debt issuance costs |  |  |  | 4,000,000 |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 749,000,000 |  |  |  |  |  |  |
Notes Due 2020 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Notes due 2030 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 1.75% |  |  |
Payments of debt issuance costs |  | 5,000,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  | $ 749,000,000 |  |  |  |  |  |  |  |  |
Notes due 2039 at 3.875% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 3.875% |  |  |
Payments of debt issuance costs |  |  |  |  |  |  | 7,000,000 |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  | $ 743,000,000 |  |  |  |
Notes due 2020 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Notes due 2029 at 2.25% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 750,000,000 |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  | 2.25% |  |  |
Payments of debt issuance costs |  |  |  |  | 5,000,000 |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 748,000,000 |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of series of debt issued | seriesOfDebt |  |  |  |  |  |  |  |  |  |  | 3
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000
Debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 10,000,000
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |

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