Retirement and Benefit Plans - Plan Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Plan assets	$ 152	$ 173
Cash equivalents
Defined Benefit Plan Disclosure
Plan assets	5	4
Mutual and exchange-traded funds
Defined Benefit Plan Disclosure
Plan assets	51	68
Debt securities
Defined Benefit Plan Disclosure
Plan assets	96	101
U.S. Treasury and federal agencies securities
Defined Benefit Plan Disclosure
Plan assets	59	63
Non-agency mortgage-backed securities | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure
Plan assets	1	1
Asset-backed securities and other debt securities
Defined Benefit Plan Disclosure
Plan assets	36	37
Level 1
Defined Benefit Plan Disclosure
Plan assets	110	129
Level 1 | Cash equivalents
Defined Benefit Plan Disclosure
Plan assets	5	4
Level 1 | Mutual and exchange-traded funds
Defined Benefit Plan Disclosure
Plan assets	51	68
Level 1 | Debt securities
Defined Benefit Plan Disclosure
Plan assets	54	57
Level 1 | U.S. Treasury and federal agencies securities
Defined Benefit Plan Disclosure
Plan assets	54	57
Level 1 | Non-agency mortgage-backed securities | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 1 | Asset-backed securities and other debt securities
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 2
Defined Benefit Plan Disclosure
Plan assets	42	44
Level 2 | Cash equivalents
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 2 | Mutual and exchange-traded funds
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 2 | Debt securities
Defined Benefit Plan Disclosure
Plan assets	42	44
Level 2 | U.S. Treasury and federal agencies securities
Defined Benefit Plan Disclosure
Plan assets	5	6
Level 2 | Non-agency mortgage-backed securities | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure
Plan assets	1	1
Level 2 | Asset-backed securities and other debt securities
Defined Benefit Plan Disclosure
Plan assets	36	37
Level 3
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | Cash equivalents
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | Mutual and exchange-traded funds
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | Debt securities
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | U.S. Treasury and federal agencies securities
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | Non-agency mortgage-backed securities | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure
Plan assets	0	0
Level 3 | Asset-backed securities and other debt securities
Defined Benefit Plan Disclosure
Plan assets	$ 0	$ 0