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
	Aug. 31, 2015	May. 31, 2015	Apr. 30, 2015	Mar. 31, 2014	May. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Commercial paper						$ 0
Long-term debt, gross						4,125,000,000	$ 4,625,000,000
Proceeds from issuance of long-term debt		$ 498,000,000		$ 498,000,000	$ 986,000,000	498,000,000	498,000,000	$ 986,000,000
Debt issuance cost							11,000,000
Interest and debt expense						90,000,000	94,000,000	95,000,000
Interest paid						99,000,000	102,000,000	102,000,000
Notes payable
Debt Instrument [Line Items]
Retirement of long-term debt	$ 750,000,000		$ 250,000,000				1,000,000,000	$ 1,500,000,000
Long-term debt, gross				500,000,000	1,000,000,000
Payments of debt issuance costs		3,000,000		3,000,000	6,000,000
Consortium of investment-grade banks \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2020						2,000,000,000
Notes due 2020 at 1.75%
Debt Instrument [Line Items]
Long-term debt, gross		$ 500,000,000				500,000,000	0
Notes due 2017 at 0.875%
Debt Instrument [Line Items]
Long-term debt, gross				250,000,000		250,000,000	250,000,000
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Long-term debt, gross				$ 250,000,000		250,000,000	250,000,000
Notes due 2018 at 1.00%
Debt Instrument [Line Items]
Long-term debt, gross					500,000,000	500,000,000	500,000,000
Notes due 2023 at 2.25%
Debt Instrument [Line Items]
Long-term debt, gross					$ 500,000,000	$ 500,000,000	$ 500,000,000