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Debt and Lines of Credit - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Commercial paper	$ 0			$ 0
Long-term debt, gross	5,850,000,000			5,850,000,000		$ 5,100,000,000
Proceeds from issuance of long-term debt				743,000,000	$ 1,500,000,000
Interest and debt expense	44,000,000		$ 30,000,000	82,000,000	$ 53,000,000
Notes due 2039 at 3.875%
Debt Instrument [Line Items]
Long-term debt, gross	750,000,000	$ 750,000,000		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			$ 2,000,000,000