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Debt and Credit Agreements - Activity Related to Long-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Movement, Debt Instruments [Roll Forward] |  |
Long-term Debt as of December 31, 2020, Current Portion | $ 401 |
Long-term Debt as of December 31, 2020, Long-term Portion | 16,304 |
Long-term Debt as of December 31, 2020, Total | 16,705 |
Long-term Debt Repaid | (360) | $ 0
Discount, Premium and Other Activity | 2 |
Long-term Debt as of March 31, 2021, Current Portion | 41 |
Long-term Debt as of March 31, 2021, Long-term Portion | 16,306 |
Long-term Debt as of March 31, 2021, Total | 16,347 |
Current Portion |  |
Movement, Debt Instruments [Roll Forward] |  |
Long-term Debt as of December 31, 2020, Current Portion | 401 |
Long-term Debt Repaid | (360) |
Discount, Premium and Other Activity | 0 |
Long-term Debt as of March 31, 2021, Current Portion | 41 |
Long-term Portion |  |
Movement, Debt Instruments [Roll Forward] |  |
Long-term Debt as of December 31, 2020, Long-term Portion | 16,304 |
Long-term Debt Repaid | 0 |
Discount, Premium and Other Activity | 2 |
Long-term Debt as of March 31, 2021, Long-term Portion | $ 16,306 |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt and lease obligation, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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