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Quarterly Results (Unaudited) Level 1 (Notes)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]
 
Three months ended
 
March 31,
June 30,
September 30,
December 31,
 
2016
2015
2016
2015
2016
2015
2016
2015
Revenues
$
4,391

$
4,617

$
4,677

$
4,685

$
4,695

$
4,562

$
4,537

$
4,513

Benefits, losses and expenses
$
4,010

$
3,992

$
4,507

$
4,215

$
4,167

$
4,183

$
4,812

$
4,009

Income (loss) from continuing operations, net of tax
$
323

$
467

$
216

$
413

$
438

$
372

$
(81
)
$
421

Income from discontinued operations, net of tax
$
—

$
—

$
—

$
—

$
—

$
9

$
—

$
—

Net income (loss)
$
323

$
467

$
216

$
413

$
438

$
381

$
(81
)
$
421

Basic earnings (losses) per common share
$
0.81

$
1.11

$
0.55

$
0.99

$
1.14

$
0.92

$
(0.22
)
$
1.03

Diluted earnings (losses) per common share
$
0.79

$
1.08

$
0.54

$
0.96

$
1.12

$
0.90

$
(0.22
)
$
1.01

Weighted average common shares outstanding, basic
398.5

422.6

391.8

418.7

383.8

413.8

376.6

406.9

Weighted average shares outstanding and dilutive potential common shares
406.3

433.7

398.6

428.1

390.5

423.0

383.8

415.9