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Benefit Plans (Fair Values of Pension and Postretirement Plan Assets) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 8,911,000,000	$ 8,167,000,000	$ 7,138,000,000
Pension [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	950,000,000	811,000,000
Pension [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	64,000,000	57,000,000
Pension [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	90,000,000	98,000,000
Pension [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	3,760,000,000	3,523,000,000
Pension [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	868,000,000	521,000,000
Pension [Member] | Common stock: International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	316,000,000	296,000,000
Pension [Member] | Common stock: U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	970,000,000	1,263,000,000
Pension [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	377,000,000	475,000,000
Pension [Member] | U S Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 924,000,000	$ 825,000,000
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember
Pension [Member] | U S Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 455,000,000	$ 386,000,000
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember
Pension [Member] | International Developed Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 114,000,000	$ 106,000,000
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember	us_gaap:FairValueMeasuredAtNetAssetValuePerShareMember
Pension [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 23,000,000	$ (194,000,000)
Pension [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,395,000,000	7,044,000,000
Pension [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,307,000,000	1,555,000,000
Pension [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] | Level 1 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Pension [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] | 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] | 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] | Level 1 [Member] | Common stock: International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	316,000,000	296,000,000
Pension [Member] | Level 1 [Member] | Common stock: U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	970,000,000	1,263,000,000
Pension [Member] | Level 1 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	21,000,000	(4,000,000)
Pension [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	6,088,000,000	5,489,000,000
Pension [Member] | Level 2 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	950,000,000	811,000,000
Pension [Member] | Level 2 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	64,000,000	57,000,000
Pension [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	90,000,000	98,000,000
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	3,760,000,000	3,523,000,000
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	868,000,000	521,000,000
Pension [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] | 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] | Level 2 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	356,000,000	479,000,000
Pension [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	1,493,000,000	1,317,000,000
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	201,000,000	213,000,000	$ 211,000,000
Postretirement Benefit Plan [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	6,000,000	11,000,000
Postretirement Benefit Plan [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	4,000,000	5,000,000
Postretirement Benefit Plan [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	55,000,000	63,000,000
Postretirement Benefit Plan [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	11,000,000	9,000,000
Postretirement Benefit Plan [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,000,000	7,000,000
Postretirement Benefit Plan [Member] | U S Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 97,000,000	$ 97,000,000
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Postretirement Benefit Plan [Member] | International Developed Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 25,000,000	$ 24,000,000
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Postretirement Benefit Plan [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ (4,000,000)	$ (3,000,000)
Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	83,000,000	95,000,000
Postretirement Benefit Plan [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [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] | 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] | 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] | 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] | Level 1 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	0	0
Postretirement Benefit Plan [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	83,000,000	95,000,000
Postretirement Benefit Plan [Member] | Level 2 [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	6,000,000	11,000,000
Postretirement Benefit Plan [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	4,000,000	5,000,000
Postretirement Benefit Plan [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	55,000,000	63,000,000
Postretirement Benefit Plan [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	11,000,000	9,000,000
Postretirement Benefit Plan [Member] | Level 2 [Member] | Other, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	7,000,000	7,000,000
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] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 122,000,000	$ 121,000,000

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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.

+ References

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Indicates level within fair value hierarchy and fair value measured at net asset value per share as practical expedient, of defined benefit plan asset.

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