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Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax |  |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | $ 20,677 |  |
Separation of retail business |  |  | $ (479)
Ending balance, accumulated other comprehensive income (loss), net of tax | 20,527 | $ 20,677 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax |  |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (367) | 350 | 108
Other comprehensive income (loss) before reclassifications | (585) | (717) | 383
Amounts reclassified from accumulated other comprehensive income (loss) | 19 | 0 | 18
Other comprehensive income (loss) | (566) | (717) | 401
Separation of retail business |  |  | (159)
Ending balance, accumulated other comprehensive income (loss), net of tax | (933) | (367) | 350
Accumulated Translation Adjustment [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax |  |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | 1 | 408 | 665
Other comprehensive income (loss) before reclassifications | (606) | (407) | (98)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Other comprehensive income (loss) | (606) | (407) | (98)
Separation of retail business |  |  | (159)
Ending balance, accumulated other comprehensive income (loss), net of tax | (605) | 1 | 408
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax |  |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (368) | (58) | (558)
Other comprehensive income (loss) before reclassifications | 21 | (309) | 483
Amounts reclassified from accumulated other comprehensive income (loss) | 19 | (1) | 17
Other comprehensive income (loss) | 40 | (310) | 500
Separation of retail business |  |  | 0
Ending balance, accumulated other comprehensive income (loss), net of tax | (328) | (368) | (58)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax |  |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | 0 | 0 | 1
Other comprehensive income (loss) before reclassifications | 0 | (1) | (2)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 1 | 1
Other comprehensive income (loss) | 0 | 0 | (1)
Separation of retail business |  |  | 0
Ending balance, accumulated other comprehensive income (loss), net of tax | $ 0 | $ 0 | $ 0

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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