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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Debt and Lines of Credit - Additional Information (Details) - USD ($)	1 Months Ended								12 Months Ended
	Nov. 30, 2017	Jun. 30, 2017	May 31, 2017	Mar. 31, 2017	May 31, 2016	Aug. 31, 2015	May 31, 2015	Apr. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Commercial paper									$ 0
Retirement of long-term debt		$ 375,000,000		$ 250,000,000
Long-term debt, gross									4,100,000,000	$ 3,625,000,000
Proceeds from issuance of long-term debt									1,099,000,000	499,000,000	$ 498,000,000
Interest and debt expense									78,000,000	80,000,000	90,000,000
Interest paid									75,000,000	88,000,000	$ 99,000,000
Notes payable
Debt Instrument [Line Items]
Retirement of long-term debt					$ 1,000,000,000	$ 750,000,000		$ 250,000,000
Long-term debt, gross			$ 600,000,000
Payments of debt issuance costs			3,000,000
Proceeds from issuance of long-term debt			605,000,000
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Long-term debt, gross			$ 300,000,000						$ 550,000,000	$ 250,000,000
Long-term debt stated interest rate (in percentage)			2.75%						2.75%	2.75%
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Long-term debt, gross			$ 300,000,000						$ 300,000,000	$ 0
Long-term debt stated interest rate (in percentage)			2.625%						2.625%	2.625%
Notes due 2027 at 2.90%
Debt Instrument [Line Items]
Long-term debt, gross	$ 500,000,000								$ 500,000,000	$ 0
Long-term debt stated interest rate (in percentage)									2.90%	2.90%
Payments of debt issuance costs	3,000,000
Proceeds from issuance of long-term debt	$ 494,000,000
Notes due 2022 at 1.85%
Debt Instrument [Line Items]
Long-term debt, gross					500,000,000				$ 500,000,000	$ 500,000,000
Long-term debt stated interest rate (in percentage)									1.85%	1.85%
Payments of debt issuance costs					3,000,000
Proceeds from issuance of long-term debt					$ 499,000,000
Notes due 2020 at 1.75%
Debt Instrument [Line Items]
Long-term debt, gross							$ 500,000,000		$ 500,000,000	$ 500,000,000
Long-term debt stated interest rate (in percentage)									1.75%	1.75%
Payments of debt issuance costs							3,000,000
Proceeds from issuance of long-term debt							$ 498,000,000
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2022									$ 2,000,000,000