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Income Taxes - Income from continuing operations before income tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income before income taxes: |  |  |
Income from continuing operations before income taxes | $ 1,669 | $ 1,689 | $ 1,765
Current: |  |  |
Total current | 263 | 490 | 468
Deferred tax expense (benefit): |  |  |
Total deferred | (24) | (223) | (134)
Total income taxes expenses | 239 | 267 | 334
UK |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | (202) | 149 | 347
Current: |  |  |
Total current | (54) | 43 | 1
Deferred tax expense (benefit): |  |  |
Total deferred | 59 | (39) | 38
U.S. federal |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | (104) | (51) | (55)
Current: |  |  |
Total current | 94 | 137 | 156
Deferred tax expense (benefit): |  |  |
Total deferred | (47) | (140) | (133)
U.S. state and local |  |  |
Current: |  |  |
Total current | 0 | 54 | 75
Deferred tax expense (benefit): |  |  |
Total deferred | 6 | (14) | (24)
Other |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | 1,975 | 1,591 | 1,473
Current: |  |  |
Total current | 223 | 256 | 236
Deferred tax expense (benefit): |  |  |
Total deferred | $ (42) | $ (30) | $ (15)

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