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Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) $ in Millions	1 Months Ended			12 Months Ended
	Aug. 31, 2015 USD ($) contract	Apr. 30, 2014 USD ($) contract	Aug. 31, 2013 USD ($) contract	Dec. 31, 2015 USD ($) contract	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Interest Rate Risk Hedging
Net deferred gains/(losses) included in AOCI				$ (1,081)	$ (467)	$ (97)	$ 80
Cash received/(paid) in connection with termination of interest rate derivatives				(48)	$ (7)	$ 8
Interest Rate Derivatives
Interest Rate Risk Hedging
Net deferred gains/(losses) included in AOCI				$ (183)
8 forward starting interest rate swaps (30-year), one | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives (in contracts) | contract				8
Notional amount of derivatives				$ 200
Rate of fixed interest to be received on interest rate swap (as a percent)				3.06%
8 forward starting interest rate swaps (30-year), two | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives (in contracts) | contract				8
Notional amount of derivatives				$ 200
Rate of fixed interest to be received on interest rate swap (as a percent)				3.14%
8 forward starting interest rate swaps (30-year), three | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives (in contracts) | contract				8
Notional amount of derivatives				$ 200
Rate of fixed interest to be received on interest rate swap (as a percent)				3.20%
8 forward starting interest rate swaps (30-year), four | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives (in contracts) | contract				8
Notional amount of derivatives				$ 200
Rate of fixed interest to be received on interest rate swap (as a percent)				2.83%
10 forward starting interest rate swaps (30-year) | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives terminated (in contracts) | contract	10
Notional amount of derivatives	$ 250
Rate of fixed interest to be received on interest rate swap (as a percent)	3.60%
Cash received/(paid) in connection with termination of interest rate derivatives	$ (31)
7 forward starting interest rate swaps (30-year) | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives terminated (in contracts) | contract	7
Notional amount of derivatives	$ 250
Rate of fixed interest to be received on interest rate swap (as a percent)	3.03%
Cash received/(paid) in connection with termination of interest rate derivatives	$ (21)
Treasury lock agreements entered into in anticipation of April 2014 issuance of senior notes | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives terminated (in contracts) | contract		5
Notional amount of derivatives		$ 250
Rate of fixed interest to be received on interest rate swap (as a percent)		3.62%
Cash received/(paid) in connection with termination of interest rate derivatives		$ (7)
5 forward starting interest rate swaps (30-year) | Cash flow hedge
Interest Rate Risk Hedging
Number of interest rate derivatives terminated (in contracts) | contract			5
Notional amount of derivatives			$ 125
Rate of fixed interest to be received on interest rate swap (as a percent)			3.39%
Cash received/(paid) in connection with termination of interest rate derivatives			$ 11

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

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