Pension and Other Postretirement Benefit Plans - Fair Value of Plan Assets Held by Pension Plans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	$ 3,856	$ 3,806
Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	3,229	3,356
Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	1,664	2,149
Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	1,251	1,207
Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	314	0
Investments measured at NAV
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	627	450
Equity securities: U.S. companies | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	646	737
Equity securities: U.S. companies | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	646	737
Equity securities: U.S. companies | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Equity securities: U.S. companies | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Equity securities: Non-U.S. companies | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	872	1,197
Equity securities: Non-U.S. companies | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	872	1,197
Equity securities: Non-U.S. companies | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Equity securities: Non-U.S. companies | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Debt securities: Corporate and government securities | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	1,197	1,086
Debt securities: Corporate and government securities | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	29	36
Debt securities: Corporate and government securities | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	1,168	1,050
Debt securities: Corporate and government securities | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Debt securities: Asset-backed securities | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	87	148
Debt securities: Asset-backed securities | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Debt securities: Asset-backed securities | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	87	148
Debt securities: Asset-backed securities | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Cash and cash equivalents | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	117	179
Cash and cash equivalents | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	117	179
Cash and cash equivalents | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Cash and cash equivalents | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Certain insurance contracts | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	314
Certain insurance contracts | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0
Certain insurance contracts | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0
Certain insurance contracts | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	314
Other plan assets, net | Total
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	(4)	9
Other plan assets, net | Level 1
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	0	0
Other plan assets, net | Level 2
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	(4)	9
Other plan assets, net | Level 3
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets held by pension plans	$ 0	$ 0