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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended			9 Months Ended		87 Months Ended
	Sep. 15, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2011	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions by employer	$ 358
Discretionary contributions by employer	$ 350	$ 350
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction in postretirement benefit obligation					$ 138
Net periodic cost			$ (6)	$ (1)		$ (17)	$ (6)	$ 83

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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