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Income Taxes - Summary of Net Operating Loss Carryforwards (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) $ 699
Tax Effected NOL 153
Valuation Allowance (VA) (120)
NOL Net of VA 33
2017 - 2021 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 87
2022 - 2033 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 132
2034 - 2036 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 219
Unlimited Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 261
Federal [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 24
Tax Effected NOL 8
Valuation Allowance (VA) (7)
NOL Net of VA 1
Federal [Member] | 2017 - 2021 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 8
Federal [Member] | 2022 - 2033 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 16
State [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 169
Tax Effected NOL 9
Valuation Allowance (VA) (1)
NOL Net of VA 8
State [Member] | 2017 - 2021 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 1
State [Member] | 2022 - 2033 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 14
State [Member] | 2034 - 2036 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 154
Foreign [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 506
Tax Effected NOL 136
Valuation Allowance (VA) (112)
NOL Net of VA 24
Foreign [Member] | 2017 - 2021 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 78
Foreign [Member] | 2022 - 2033 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 102
Foreign [Member] | 2034 - 2036 Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) 65
Foreign [Member] | Unlimited Expiration [Member]  
Operating Loss Carryforwards [Line Items]  
Total Net Operating Loss (NOL) $ 261