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Employee Benefit Plans and Postretirement Benefits - Summary of Fair Value of Plan Assets by Asset Category and Level Within Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category $ 1,952 $ 2,248
Total Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Non-U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Total Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 148 230
U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 32 124
U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 42 34
Non-U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 49 47
Non-U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 25 25
Mortgage backed securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Other fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Total Other types of investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 1,782 1,973
Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 1,582 1,802
Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 200 171
Derivatives—credit contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 22 45
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 76 173
Level 1 | Total Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Non-U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Total Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 45 136
Level 1 | U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 30 122
Level 1 | U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 5 5
Level 1 | Non-U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 10 9
Level 1 | Non-U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Mortgage backed securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Other fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Total Other types of investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 21 20
Level 1 | Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 21 20
Level 1 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Derivatives—credit contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 1 | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 10 17
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 1,676 1,904
Level 2 | Total Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Non-U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Total Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 103 94
Level 2 | U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 2 2
Level 2 | U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 37 29
Level 2 | Non-U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 39 38
Level 2 | Non-U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 25 25
Level 2 | Mortgage backed securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Other fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Total Other types of investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 1,561 1,782
Level 2 | Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 1,561 1,782
Level 2 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Derivatives—credit contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 2 | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 12 28
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 200 171
Level 3 | Total Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Non-U.S. equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Total Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Non-U.S. government bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Non-U.S. corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Mortgage backed securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Other fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Total Other types of investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 200 171
Level 3 | Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 200 171
Level 3 | Derivatives—credit contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category 0 0
Level 3 | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets by asset category $ 0 $ 0