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Debt and Lines of Credit - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | May 31, 2018 | Nov. 30, 2017 | Jun. 30, 2017 | May 31, 2017 | Mar. 31, 2017 | Sep. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  | $ 500,000,000 |  | $ 375,000,000 |  | $ 250,000,000 |  |  |  |  |  |
Principal amount |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | 605,000,000 |  |  |  |  | $ 1,491,000,000 | $ 1,500,000,000 | $ 1,099,000,000
Interest and debt expense |  |  |  |  |  |  |  |  |  | 170,000,000 | 125,000,000 | 78,000,000
Interest paid |  |  |  |  |  |  |  |  |  | $ 156,000,000 | $ 114,000,000 | $ 75,000,000
Notes due 2019 at 1.65% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  |  | 1.65% |  |
Notes due 2039 at 3.875% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  | 7,000,000 |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  | $ 743,000,000 |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  |  | 3.875% |  |
Notes due 2029 at 2.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  |  | 5,000,000 |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  | $ 748,000,000 |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  |  | 2.25% |  |
Notes due 2048 at 4.15% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  |  | 16,000,000 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  |  | 4.15% |  |
4.15% Notes issued in May 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |
4.15% Notes issued in June 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |
Notes due 2021 at 2.75% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  | 2.75% |  |  |  |  | 2.75% |  |
Notes due 2024 at 2.625% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  | 2.625% |  |  |  |  | 2.625% |  |
Notes due 2027 at 2.90% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  | 3,000,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 494,000,000 |  |  |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  |  | 2.90% |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |

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