Debt and Lines of Credit - Additional Information (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Commercial paper	$ 0
Long-term debt, gross	5,850,000,000		$ 5,100,000,000
Proceeds from issuance of long-term debt	743,000,000	$ 0
Interest and debt expense	38,000,000	$ 23,000,000
Notes due 2039 at 3.875%
Debt Instrument [Line Items]
Long-term debt, gross	750,000,000		$ 0
Payments of debt issuance costs	7,000,000
Proceeds from issuance of long-term debt	743,000,000
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2024	$ 2,000,000,000

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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