Employee Benefit Plans (Reconciliation Of Changes In Plan Assets Benefit Obligations And Funded Status) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability		$ (2,641)		$ (2,622)
Decrease in other comprehensive income		2		1	$ 14
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1		2,035		2,092
Actual return on plan assets		167		(26)
Company contributions		52		61
Plan participant contribution		85		68
Benefits and expenses paid		(166)		(160)
Fair value of plan assets at December 31		2,173		2,035	2,092
Projected benefit obligation at January 1		1,766		1,811
Service cost for benefits earned		52		55
Interest cost		76		71	76
Actuarial (gain) loss		11		(98)
Plan amendments		37		0
Benefits and expenses paid		(153)		(146)
Federal subsidy on benefits paid		3		4
Projected benefit obligation at December 31		1,877		1,766	1,811
Current liability	[1]	(72)		(75)
Net assets (liabilities) at end of year		296		269
Noncurrent asset	[1]	368		344
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1		13,745		14,216
Actual return on plan assets		1,358		(176)
Company contributions		334		334
Benefits and expenses paid		(708)		(629)
Fair value of plan assets at December 31		14,729		13,745	14,216
Projected benefit obligation at January 1		16,299		16,696
Service cost for benefits earned		453		479
Interest cost		715		673	695
Actuarial (gain) loss		637		(922)
Plan amendments		(91)		1
Transitional costs		0
Benefits and expenses paid		(708)		(629)
Projected benefit obligation at December 31		17,305	[2]	16,299	$ 16,696
Current liability		(7)		(6)
Noncurrent liability		(2,569)		(2,547)
Net assets (liabilities) at end of year		$ (2,576)		$ (2,553)

[1] At December 31, 2016 and 2015, the postretirement medical plan was in an overfunded position and the postretirement life insurance plan was in an underfunded position.

[2] PG&E Corporation's accumulated benefit obligation was $15.6 billion and $14.7 billion at December 31, 2016 and 2015, respectively.