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Investments (Unrealized Losses and Fair Values) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | $ 20,139 | $ 25,250
Less than 12 months, Unrealized losses | (468) | (191)
12 months or more, Fair value | 1,370 | 2,061
12 months or more, Unrealized losses | (40) | (31)
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 5,023 | 7,728
Less than 12 months, Unrealized losses | (103) | (70)
12 months or more, Fair value | 53 | 195
12 months or more, Unrealized losses | (1) | (2)
Other government-related debt securities - U.S. [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 103 | 188
Less than 12 months, Unrealized losses | (2) | (1)
12 months or more, Fair value | 26 | 34
12 months or more, Unrealized losses | (1) | (1)
Other government-related debt securities - Foreign and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,367 | 1,163
Less than 12 months, Unrealized losses | (39) | (9)
12 months or more, Fair value | 88 | 115
12 months or more, Unrealized losses | (4) | (2)
Corporate debt securities - Financial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 5,648 | 5,928
Less than 12 months, Unrealized losses | (128) | (28)
12 months or more, Fair value | 325 | 462
12 months or more, Unrealized losses | (9) | (6)
Corporate debt securities - Industrial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 4,702 | 5,760
Less than 12 months, Unrealized losses | (117) | (43)
12 months or more, Fair value | 397 | 612
12 months or more, Unrealized losses | (11) | (9)
Corporate debt securities - Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 727 | 868
Less than 12 months, Unrealized losses | (18) | (4)
12 months or more, Fair value | 93 | 117
12 months or more, Unrealized losses | (3) | (2)
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,464 | 1,838
Less than 12 months, Unrealized losses | (39) | (24)
12 months or more, Fair value | 226 | 276
12 months or more, Unrealized losses | (7) | (6)
Other mortgage- and asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,105 | 1,777
Less than 12 months, Unrealized losses | (22) | (12)
12 months or more, Fair value | 162 | 250
12 months or more, Unrealized losses | $ (4) | $ (3)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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