Debt and Credit Facilities (Maturities Of Long-Term Debt Disclosures) (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Commercial Paper	$ 0	$ 200,000,000
Total debt	7,222,000,000	6,914,000,000
Current maturities of debt	632,000,000	228,000,000
Total Long-term Debt	6,590,000,000	6,686,000,000
Unamortized debt issuance costs	39,000,000	45,000,000
Borrowing capacity on existing facilities	1,547,000,000	1,551,000,000
Fair value of senior unsecured notes	$ 7,521,000,000	6,762,000,000
Senior Unsecured Notes 1.30% due 2018
Stated interest rate	1.30%
Maturity date	Apr. 01, 2018
Unsecured Debt	$ 600,000,000	598,000,000
Senior Unsecured Notes 1.800% due 2019
Stated interest rate	1.80%
Maturity date	Jan. 15, 2019
Unsecured Debt	$ 499,000,000	0
Senior Unsecured Notes 2.000% due 2019
Stated interest rate	2.00%
Maturity date	Mar. 08, 2019
Unsecured Debt	$ 748,000,000	746,000,000
Senior Unsecured Notes 4.375% Due 2020
Stated interest rate	4.375%
Maturity date	Jan. 15, 2020
Unsecured Debt	$ 498,000,000	497,000,000
Senior Unsecured Notes 2.625% due 2021
Stated interest rate	2.625%
Maturity date	Mar. 15, 2021
Unsecured Debt	$ 746,000,000	745,000,000
Senior Unsecured Notes 3.375% due 2024
Stated interest rate	3.375%
Maturity date	May 15, 2024
Unsecured Debt	$ 598,000,000	602,000,000
Senior Unsecured Notes 3.375% due 2025
Stated interest rate	3.375%
Maturity date	Nov. 01, 2025
Unsecured Debt	$ 745,000,000	744,000,000
Senior Unsecured Notes 3.50% due 2026
Stated interest rate	3.50%
Maturity date	Mar. 15, 2026
Unsecured Debt	$ 988,000,000	987,000,000
Senior Unsecured Notes 4.10% due 2043
Stated interest rate	4.10%
Maturity date	Apr. 01, 2043
Unsecured Debt	$ 391,000,000	391,000,000
Senior Unsecured Notes 4.375% due 2044
Stated interest rate	4.375%
Maturity date	May 15, 2044
Unsecured Debt	$ 394,000,000	395,000,000
Senior Unsecured Notes 4.625% due 2046
Stated interest rate	4.625%
Maturity date	Mar. 15, 2046
Unsecured Debt	$ 980,000,000	979,000,000
Other
Unsecured Debt	$ 35,000,000	$ 30,000,000

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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