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Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Disclosure [Abstract] |  |  |  |  |
Loss on early extinguishment of debt | $ 0 | $ 0 | $ (168) | [1] | $ 0
Long-term Debt, Excluding Current Maturities | 1,500 |  | 1,500 |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Excluding Current Maturities | 1,500 |  | 1,500 |  |
Senior Notes due March 2030 [Member] |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |
Long-term Debt, Excluding Current Maturities | $ 1,000 |  | $ 1,000 |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.92% |  | 2.92% |  |
Long-term Debt, Excluding Current Maturities | $ 1,000 |  | $ 1,000 |  |
Senior notes due August 2023 [Member] |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |
Long-term Debt, Excluding Current Maturities | $ 500 |  | $ 500 |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  | 3.50% |  |
Long-term Debt, Excluding Current Maturities | $ 500 |  | $ 500 |  |
Senior Notes due November 2025 [Member] |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |
Long-term Debt, Excluding Current Maturities | $ 1,000 |  | $ 1,000 |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.80% |  | 3.80% |  |
Long-term Debt, Excluding Current Maturities | $ 1,000 |  | $ 1,000 |  |
[1] | For the nine months ended September 30, 2020, amount includes a $168 million loss on extinguishment of debt related to the early repurchase of senior notes. See Note 6 for further discussion on this charge.

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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