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Benefit Plans (Fair Values of Pension and Postretirement Plan Assets) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 8,167,000,000	$ 7,138,000,000	$ 8,015,000,000
Pension [Member] | Fair Value, Recurring [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	8,167,000,000	7,138,000,000
Pension [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	(194,000,000)	48,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,555,000,000	1,355,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Common stock: International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	296,000,000	237,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Common stock: U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,263,000,000	1,082,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	(4,000,000)	36,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	5,489,000,000	3,599,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	811,000,000	868,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	57,000,000	73,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	98,000,000	115,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	3,523,000,000	1,726,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	521,000,000	478,000,000
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Common stock: International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Common stock: U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	479,000,000	339,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,044,000,000	4,954,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	811,000,000	868,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	57,000,000	73,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	98,000,000	115,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	3,523,000,000	1,726,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	521,000,000	478,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Common stock: International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	296,000,000	237,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Common stock: U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,263,000,000	1,082,000,000
Pension [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	475,000,000	375,000,000
Pension [Member] | Fair Value, Recurring [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,317,000,000	2,136,000,000
Pension [Member] | Fair Value, Recurring [Member] | NAV [Member] | U S Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	825,000,000	1,722,000,000
Pension [Member] | Fair Value, Recurring [Member] | NAV [Member] | U S Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	386,000,000	328,000,000
Pension [Member] | Fair Value, Recurring [Member] | NAV [Member] | International Developed Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	106,000,000	86,000,000
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	213,000,000	211,000,000	$ 270,000,000
Postretirement Benefit Plan [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	213,000,000	211,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	(3,000,000)	9,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	2,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	2,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	95,000,000	97,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	11,000,000	13,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	5,000,000	3,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	63,000,000	71,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	9,000,000	8,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,000,000	2,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	95,000,000	99,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	11,000,000	13,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	5,000,000	3,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	63,000,000	71,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	9,000,000	8,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,000,000	4,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	121,000,000	103,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | NAV [Member] | U S Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	97,000,000	77,000,000
Postretirement Benefit Plan [Member] | Fair Value, Recurring [Member] | NAV [Member] | International Developed Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 24,000,000	$ 26,000,000

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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