Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Proceeds from Issuance of Debt	$ 3,500
Debt, Long-term and Short-term, Combined Amount	7,476	$ 3,998
Debt, Current	770	768
Long-term debt, excluding current maturities	6,706	3,230
Line of Credit Facility, Remaining Borrowing Capacity	1,305
Unamortized Debt Issuance Expense	50
Debt Instrument, Fair Value Disclosure	$ 7,702	4,009
New Accounting Pronouncement, Early Adoption, Effect
Long-term debt, excluding current maturities		(24)
Commercial Paper
Debt Instrument, Maturity	397
Commercial Paper \| Maximum
Commercial paper	$ 0
Senior Unsecured Notes 2.00% due 2016
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Maturity Date	Sep. 30, 2016
Unsecured Debt	$ 750	749
Senior Unsecured Notes 1.30% due 2018
Debt Instrument, Interest Rate, Stated Percentage	1.30%
Debt Instrument, Maturity Date	Apr. 01, 2018
Unsecured Debt	$ 597	597
Senior Unsecured Notes 2.000% due 2019
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Maturity Date	Mar. 08, 2019
Unsecured Debt	$ 745	0
Senior Unsecured Notes 4.375% Due 2020
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Debt Instrument, Maturity Date	Jan. 15, 2020
Unsecured Debt	$ 496	496
Senior Unsecured Notes 2.625% due 2021
Debt Instrument, Interest Rate, Stated Percentage	2.625%
Debt Instrument, Maturity Date	Mar. 15, 2021
Unsecured Debt	$ 744	0
Senior Unsecured Notes 3.375% due 2024
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Debt Instrument, Maturity Date	May 15, 2024
Unsecured Debt	$ 627	606
Senior Unsecured Notes 3.375% due 2025
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Debt Instrument, Maturity Date	Nov. 01, 2025
Unsecured Debt	$ 744	744
Senior Unsecured Notes 3.50% due 2026
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Debt Instrument, Maturity Date	Mar. 15, 2026
Unsecured Debt	$ 986	0
Senior Unsecured Notes 4.10% due 2043
Debt Instrument, Interest Rate, Stated Percentage	4.10%
Debt Instrument, Maturity Date	Apr. 01, 2043
Unsecured Debt	$ 391	390
Senior Unsecured Notes 4.375% due 2044
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Debt Instrument, Maturity Date	May 15, 2044
Unsecured Debt	$ 394	394
Senior Unsecured Notes 4.625% due 2018
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Debt Instrument, Maturity Date	Mar. 15, 2046
Unsecured Debt	$ 979	0
Other Debt
Unsecured Debt	$ 23	$ 22

Debt Instrument, Maturity

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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