(Trust Preferred Securities) (Details) - USD ($)
$ in Millions |
9 Months Ended |
|
Sep. 30, 2016 |
Dec. 31, 2015 |
| Trust Preferred Securities [Abstract] |
|
|
| Maximum period for interest payment deferment (in quarters) |
60 months
|
|
| Junior subordinated notes |
$ 247
|
$ 247
|
| Long-term Debt |
493
|
247
|
| 6.125% senior notes, matures 2021 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Senior note |
$ 246
|
0
|
| Interest rate |
6.125%
|
|
| 3ML plus 3.25% maturing 2032 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
3.25%
|
|
| Junior subordinated notes |
$ 26
|
$ 26
|
| Interest rate |
4.11%
|
3.85%
|
| 3ML plus 3.25% maturing 2033 A |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
3.25%
|
|
| Junior subordinated notes |
$ 26
|
$ 26
|
| Interest rate |
3.93%
|
3.57%
|
| 3ML plus 3.25% maturing 2033 B |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
3.25%
|
|
| Junior subordinated notes |
$ 26
|
$ 26
|
| Interest rate |
3.88%
|
3.85%
|
| 3ML plus 2.00% maturing 2035 A |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
2.00%
|
|
| Junior subordinated notes |
$ 26
|
$ 26
|
| Interest rate |
2.68%
|
2.32%
|
| 3ML plus 2.00% maturing 2035 B |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
2.00%
|
|
| Junior subordinated notes |
$ 26
|
$ 26
|
| Interest rate |
2.68%
|
2.32%
|
| 3ML plus 1.75% maturing 2035 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
1.75%
|
|
| Junior subordinated notes |
$ 51
|
$ 51
|
| Interest rate |
2.60%
|
2.26%
|
| 3ML plus 1.50% maturing 2035 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
1.50%
|
|
| Junior subordinated notes |
$ 25
|
$ 25
|
| Interest rate |
2.18%
|
1.82%
|
| 3ML plus 1.45% maturing 2037 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
1.45%
|
|
| Junior subordinated notes |
$ 25
|
$ 25
|
| Interest rate |
2.30%
|
1.96%
|
| 3ML plus 2.50% maturing 2037 |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Interest rate |
2.50%
|
|
| Junior subordinated notes |
$ 16
|
$ 16
|
| Interest rate |
3.35%
|
3.01%
|
| Junior Subordinated Debt |
|
|
| Trust Preferred Securities [Abstract] |
|
|
| Current Period for Interest Payment Deferment (in Quarters) |
54 months
|
|