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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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Debt and Lines of Credit - Additional Information (Details) - USD ($)	1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 30, 2017	May 31, 2017	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Oct. 26, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Commercial paper				$ 0		$ 0
Retirement of long-term debt	$ 375,000,000		$ 250,000,000
Long-term debt, gross				3,600,000,000		3,600,000,000			$ 3,625,000,000
Proceeds from issuance of long-term debt						605,000,000	$ 499,000,000
Interest and debt expense				19,000,000	$ 18,000,000	57,000,000	$ 61,000,000
Subsequent Event
Debt Instrument [Line Items]
Long-term debt, gross								$ 500,000,000
Notes payable
Debt Instrument [Line Items]
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		$ 550,000,000			$ 250,000,000
Long-term debt stated interest rate (in percentage)		2.75%		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		$ 300,000,000			$ 0
Long-term debt stated interest rate (in percentage)		2.625%		2.625%		2.625%			2.625%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2022				$ 2,000,000,000		$ 2,000,000,000