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Pension and Other Postemployment Benefits (Details 6) - OPEB - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in the fair value of pension investments
Beginning balance	$ 438
Actual return on plan assets:
Ending balance	424	$ 438
Real Estate Funds
Reconciliation of changes in the fair value of pension investments
Beginning balance	2
Actual return on plan assets:
Ending balance	0	2
Level 3
Reconciliation of changes in the fair value of pension investments
Beginning balance	2
Actual return on plan assets:
Ending balance	0	2
Level 3 | Real Estate Funds
Reconciliation of changes in the fair value of pension investments
Beginning balance	2	3
Actual return on plan assets:
Transfers in (out)	(2)	(1)
Ending balance	$ 0	$ 2

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Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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