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Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	$ 1,865	$ 1,902	$ 1,057
Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,791	1,836	1,032
Significant Unobservable Inputs (Level 3) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	70	62	22
Significant Unobservable Inputs (Level 3) | Private equity and other
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4	4	$ 3
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	12,802	11,430
Pension Plans | Total Fair Value
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	10,389	9,133
Pension Plans | Total Fair Value | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	2,230	2,190
Pension Plans | Total Fair Value | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4	2
Pension Plans | Total Fair Value | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1	2
Pension Plans | Total Fair Value | Pooled funds - equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	2,225	2,186
Pension Plans | Total Fair Value | Total fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	7,822	6,630
Pension Plans | Total Fair Value | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4,340	3,328
Pension Plans | Total Fair Value | Pooled funds - fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	622	575
Pension Plans | Total Fair Value | Corporate bonds and other fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	2,860	2,727
Pension Plans | Total Fair Value | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	212	186
Pension Plans | Total Fair Value | Private equity
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	3	3
Pension Plans | Total Fair Value | Other
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	5	2
Pension Plans | Total Fair Value | Cash
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	117	122
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	2,014	1,672
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,004	894
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4	2
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1	2
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	999	890
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	757	536
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	60	53
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	439	417
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	258	66
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	142	124
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private equity
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4	1
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	107	117
Pension Plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	6,510	5,559
Pension Plans | Significant Other Observable Inputs (Level 2) | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,226	1,296
Pension Plans | Significant Other Observable Inputs (Level 2) | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Other Observable Inputs (Level 2) | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,226	1,296
Pension Plans | Significant Other Observable Inputs (Level 2) | Total fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	5,274	4,258
Pension Plans | Significant Other Observable Inputs (Level 2) | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	4,280	3,275
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	183	158
Pension Plans | Significant Other Observable Inputs (Level 2) | Corporate bonds and other fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	811	825
Pension Plans | Significant Other Observable Inputs (Level 2) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Other Observable Inputs (Level 2) | Private equity
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Other Observable Inputs (Level 2) | Other
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Other Observable Inputs (Level 2) | Cash
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	10	5
Pension Plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,865	1,902
Pension Plans | Significant Unobservable Inputs (Level 3) | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - equity securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | Total fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,791	1,836
Pension Plans | Significant Unobservable Inputs (Level 3) | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1,791	1,836
Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	70	62
Pension Plans | Significant Unobservable Inputs (Level 3) | Private equity
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	3	3
Pension Plans | Significant Unobservable Inputs (Level 3) | Other
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	1	1
Pension Plans | Significant Unobservable Inputs (Level 3) | Cash
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Pension Plans | Investments measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	$ 2,413	$ 2,297

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