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Quarterly Results (Unaudited) Level 3 (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Three months ended
 
March 31,
June 30,
September 30,
December 31,
 
2017
2016
2017
2016
2017
2016
2017
2016
Total revenues
$
527

$
487

$
595

$
622

$
533

$
702

$
577

$
571

Total benefits, losses and expenses
$
441

$
478

$
450

$
474

$
462

$
610

$
503

$
464

Net income
$
75

$
28

$
112

$
118

$
83

$
79

$
(316
)
$
57