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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited to Cash Flow
The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the statement of cash flows.
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In millions)
Cash and cash equivalents
$
991

 
$
938

 
$
853

Funds deposited by counterparties
37

 
2

 
55

Restricted cash
508

 
446

 
414

Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows
$
1,536

 
$
1,386

 
$
1,322
Changes in Redeemable Noncontrolling Interest
The following table reflects the changes in the Company's redeemable noncontrolling interest balance for the years ended December 31, 2017, 2016, and 2015.
 
(In millions)
Balance as of December 31, 2014
$
19

Cash contributions from redeemable noncontrolling interest
27

Comprehensive loss attributable to redeemable noncontrolling interest
(17
)
Balance as of December 31, 2015
29

Distributions to redeemable noncontrolling interest
(1
)
Contributions from redeemable noncontrolling interest
33

Non-cash adjustments to redeemable noncontrolling interest
23

Comprehensive loss attributable to redeemable noncontrolling interest
(38
)
Balance as of December 31, 2016
46

Distributions to redeemable noncontrolling interest
(2
)
Contributions from redeemable noncontrolling interest
99

Non-cash adjustments to redeemable noncontrolling interest
7

Comprehensive loss attributable to redeemable noncontrolling interest
(72
)
Balance as of December 31, 2017
$
78